diff --git a/cmds/rawbu/backup.cpp b/cmds/rawbu/backup.cpp
new file mode 100644
index 0000000..70e7b57
--- /dev/null
+++ b/cmds/rawbu/backup.cpp
@@ -0,0 +1,746 @@
+// Copyright 2009 The Android Open Source Project
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <dirent.h>
+#include <errno.h>
+#include <assert.h>
+#include <ctype.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <stdint.h>
+
+#include <cutils/properties.h>
+
+#include <private/android_filesystem_config.h>
+
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
+// First version.
+#define FILE_VERSION_1 0xffff0001
+
+// Introduces backup all option to header.
+#define FILE_VERSION_2 0xffff0002
+
+#define FILE_VERSION FILE_VERSION_2
+
+namespace android {
+
+static char nameBuffer[PATH_MAX];
+static struct stat statBuffer;
+
+static char copyBuffer[8192];
+static char *backupFilePath = NULL;
+
+static uint32_t inputFileVersion;
+
+static int opt_backupAll;
+
+#define SPECIAL_NO_TOUCH 0
+#define SPECIAL_NO_BACKUP 1
+
+struct special_dir {
+    const char* path;
+    int type;
+};
+
+/* Directory paths that we will not backup/restore */
+static const struct special_dir SKIP_PATHS[] = {
+    { "/data/misc", SPECIAL_NO_TOUCH },
+    { "/data/system/batterystats.bin", SPECIAL_NO_TOUCH },
+    { "/data/system/location", SPECIAL_NO_TOUCH },
+    { "/data/dalvik-cache", SPECIAL_NO_BACKUP },
+    { NULL, 0 },
+};
+
+/* This is just copied from the shell's built-in wipe command. */
+static int wipe (const char *path) 
+{
+    DIR *dir;
+    struct dirent *de;
+    int ret;
+    int i;
+
+    dir = opendir(path);
+
+    if (dir == NULL) {
+        fprintf (stderr, "Error opendir'ing %s: %s\n",
+                    path, strerror(errno));
+        return 0;
+    }
+
+    char *filenameOffset;
+
+    strcpy(nameBuffer, path);
+    strcat(nameBuffer, "/");
+
+    filenameOffset = nameBuffer + strlen(nameBuffer);
+
+    for (;;) {
+        de = readdir(dir);
+
+        if (de == NULL) {
+            break;
+        }
+
+        if (0 == strcmp(de->d_name, ".")
+                || 0 == strcmp(de->d_name, "..")
+                || 0 == strcmp(de->d_name, "lost+found")
+        ) {
+            continue;
+        }
+
+        strcpy(filenameOffset, de->d_name);
+        bool noBackup = false;
+        
+        /* See if this is a path we should skip. */
+        for (i = 0; SKIP_PATHS[i].path; i++) {
+            if (strcmp(SKIP_PATHS[i].path, nameBuffer) == 0) {
+                if (opt_backupAll || SKIP_PATHS[i].type == SPECIAL_NO_BACKUP) {
+                    // In this case we didn't back up the directory --
+                    // we do want to wipe its contents, but not the
+                    // directory itself, since the restore file won't
+                    // contain the directory.
+                    noBackup = true;
+                }
+                break;
+            }
+        }
+        
+        if (!noBackup && SKIP_PATHS[i].path != NULL) {
+            // This is a SPECIAL_NO_TOUCH directory.
+            continue;
+        }
+
+        ret = lstat (nameBuffer, &statBuffer);
+
+        if (ret != 0) {
+            fprintf(stderr, "warning -- stat() error on '%s': %s\n", 
+                    nameBuffer, strerror(errno));
+            continue;
+        }
+
+        if(S_ISDIR(statBuffer.st_mode)) {
+            int i;
+            char *newpath;
+
+            newpath = strdup(nameBuffer);
+            if (wipe(newpath) == 0) {
+                free(newpath);
+                closedir(dir);
+                return 0;
+            }
+            
+            if (!noBackup) {
+                ret = rmdir(newpath);
+                if (ret != 0) {
+                    fprintf(stderr, "warning -- rmdir() error on '%s': %s\n", 
+                        newpath, strerror(errno));
+                }
+            }
+
+            free(newpath);
+
+            strcpy(nameBuffer, path);
+            strcat(nameBuffer, "/");
+
+        } else {
+            // Don't delete the backup file
+            if (backupFilePath && strcmp(backupFilePath, nameBuffer) == 0) {
+                continue;
+            }
+            ret = unlink(nameBuffer);
+
+            if (ret != 0) {
+                fprintf(stderr, "warning -- unlink() error on '%s': %s\n", 
+                    nameBuffer, strerror(errno));
+            }
+        }
+    }
+
+    closedir(dir);
+    
+    return 1;
+}
+
+static int write_int32(FILE* fh, int32_t val)
+{
+    int res = fwrite(&val, 1, sizeof(val), fh);
+    if (res != sizeof(val)) {
+        fprintf(stderr, "unable to write int32 (%d bytes): %s\n", res, strerror(errno));
+        return 0;
+    }
+    
+    return 1;
+}
+
+static int write_int64(FILE* fh, int64_t val)
+{
+    int res = fwrite(&val, 1, sizeof(val), fh); 
+    if (res != sizeof(val)) {
+        fprintf(stderr, "unable to write int64 (%d bytes): %s\n", res, strerror(errno));
+        return 0;
+    }
+    
+    return 1;
+}
+
+static int copy_file(FILE* dest, FILE* src, off_t size, const char* destName,
+        const char* srcName)
+{
+    errno = 0;
+    
+    off_t origSize = size;
+    
+    while (size > 0) {
+        int amt = size > (off_t)sizeof(copyBuffer) ? sizeof(copyBuffer) : (int)size;
+        int readLen = fread(copyBuffer, 1, amt, src);
+        if (readLen <= 0) {
+            if (srcName != NULL) {
+                fprintf(stderr, "unable to read source (%d of %ld bytes) file '%s': %s\n",
+                    amt, origSize, srcName, errno != 0 ? strerror(errno) : "unexpected EOF");
+            } else {
+                fprintf(stderr, "unable to read buffer (%d of %ld bytes): %s\n",
+                    amt, origSize, errno != 0 ? strerror(errno) : "unexpected EOF");
+            }
+            return 0;
+        }
+        int writeLen = fwrite(copyBuffer, 1, readLen, dest); 
+        if (writeLen != readLen) {
+            if (destName != NULL) {
+                fprintf(stderr, "unable to write file (%d of %d bytes) '%s': '%s'\n",
+                    writeLen, readLen, destName, strerror(errno));
+            } else {
+                fprintf(stderr, "unable to write buffer (%d of %d bytes): '%s'\n",
+                    writeLen, readLen, strerror(errno));
+            }
+            return 0;
+        }
+        size -= readLen;
+    }
+    return 1;
+}
+
+#define TYPE_END 0
+#define TYPE_DIR 1
+#define TYPE_FILE 2
+
+static int write_header(FILE* fh, int type, const char* path, const struct stat* st)
+{
+    int pathLen = strlen(path);
+    if (!write_int32(fh, type)) return 0;
+    if (!write_int32(fh, pathLen)) return 0;
+    if (fwrite(path, 1, pathLen, fh) != (size_t)pathLen) {
+        fprintf(stderr, "unable to write: %s\n", strerror(errno));
+        return 0;
+    }
+    
+    if (!write_int32(fh, st->st_uid)) return 0;
+    if (!write_int32(fh, st->st_gid)) return 0;
+    if (!write_int32(fh, st->st_mode)) return 0;
+    if (!write_int64(fh, ((int64_t)st->st_atime)*1000*1000*1000)) return 0;
+    if (!write_int64(fh, ((int64_t)st->st_mtime)*1000*1000*1000)) return 0;
+    if (!write_int64(fh, ((int64_t)st->st_ctime)*1000*1000*1000)) return 0;
+    
+    return 1;
+}
+
+static int backup_dir(FILE* fh, const char* srcPath)
+{
+    DIR *dir;
+    struct dirent *de;
+    char* fullPath = NULL;
+    int srcLen = strlen(srcPath);
+    int result = 1;
+    int i;
+    
+    dir = opendir(srcPath);
+
+    if (dir == NULL) {
+        fprintf (stderr, "error opendir'ing '%s': %s\n",
+                    srcPath, strerror(errno));
+        return 0;
+    }
+    
+    for (;;) {
+        de = readdir(dir);
+
+        if (de == NULL) {
+            break;
+        }
+
+        if (0 == strcmp(de->d_name, ".")
+                || 0 == strcmp(de->d_name, "..")
+                || 0 == strcmp(de->d_name, "lost+found")
+        ) {
+            continue;
+        }
+
+        if (fullPath != NULL) {
+            free(fullPath);
+        }
+        fullPath = (char*)malloc(srcLen + strlen(de->d_name) + 2);
+        strcpy(fullPath, srcPath);
+        fullPath[srcLen] = '/';
+        strcpy(fullPath+srcLen+1, de->d_name);
+
+        /* See if this is a path we should skip. */
+        if (!opt_backupAll) {
+            for (i = 0; SKIP_PATHS[i].path; i++) {
+                if (strcmp(SKIP_PATHS[i].path, fullPath) == 0) {
+                    break;
+                }
+            }
+            if (SKIP_PATHS[i].path != NULL) {
+                continue;
+            }
+        }
+
+        int ret = lstat(fullPath, &statBuffer);
+
+        if (ret != 0) {
+            fprintf(stderr, "stat() error on '%s': %s\n", 
+                    fullPath, strerror(errno));
+            result = 0;
+            goto done;
+        }
+
+        if(S_ISDIR(statBuffer.st_mode)) {
+            printf("Saving dir %s...\n", fullPath);
+            
+            if (write_header(fh, TYPE_DIR, fullPath, &statBuffer) == 0) {
+                result = 0;
+                goto done;
+            }
+            if (backup_dir(fh, fullPath) == 0) {
+                result = 0;
+                goto done;
+            }
+        } else if (S_ISREG(statBuffer.st_mode)) {
+            // Skip the backup file
+            if (backupFilePath && strcmp(fullPath, backupFilePath) == 0) {
+                printf("Skipping backup file %s...\n", backupFilePath);
+                continue;
+            } else {
+                printf("Saving file %s...\n", fullPath);
+            }
+            if (write_header(fh, TYPE_FILE, fullPath, &statBuffer) == 0) {
+                result = 0;
+                goto done;
+            }
+            
+            off_t size = statBuffer.st_size;
+            if (!write_int64(fh, size)) {
+                result = 0;
+                goto done;
+            }
+            
+            FILE* src = fopen(fullPath, "r");
+            if (src == NULL) {
+                fprintf(stderr, "unable to open source file '%s': %s\n",
+                    fullPath, strerror(errno));
+                result = 0;
+                goto done;
+            }
+            
+            int copyres = copy_file(fh, src, size, NULL, fullPath);
+            fclose(src);
+            if (!copyres) {
+                result = 0;
+                goto done;
+            }
+        }
+    }
+
+done:
+    if (fullPath != NULL) {
+        free(fullPath);
+    }
+    
+    closedir(dir);
+    
+    return result;
+}
+
+static int backup_data(const char* destPath)
+{
+    int res = -1;
+    
+    FILE* fh = fopen(destPath, "w");
+    if (fh == NULL) {
+        fprintf(stderr, "unable to open destination '%s': %s\n",
+                destPath, strerror(errno));
+        return -1;
+    }
+    
+    printf("Backing up /data to %s...\n", destPath);
+
+    // The path that shouldn't be backed up
+    backupFilePath = strdup(destPath);
+
+    if (!write_int32(fh, FILE_VERSION)) goto done;
+    if (!write_int32(fh, opt_backupAll)) goto done;
+    if (!backup_dir(fh, "/data")) goto done;
+    if (!write_int32(fh, 0)) goto done;
+    
+    res = 0;
+    
+done:
+    if (fflush(fh) != 0) {
+        fprintf(stderr, "error flushing destination '%s': %s\n",
+            destPath, strerror(errno));
+        res = -1;
+        goto donedone;
+    }
+    if (fsync(fileno(fh)) != 0) {
+        fprintf(stderr, "error syncing destination '%s': %s\n",
+            destPath, strerror(errno));
+        res = -1;
+        goto donedone;
+    }
+    fclose(fh);
+    sync();
+
+donedone:    
+    return res;
+}
+
+static int32_t read_int32(FILE* fh, int32_t defVal)
+{
+    int32_t val;
+    if (fread(&val, 1, sizeof(val), fh) != sizeof(val)) {
+        fprintf(stderr, "unable to read: %s\n", strerror(errno));
+        return defVal;
+    }
+    
+    return val;
+}
+
+static int64_t read_int64(FILE* fh, int64_t defVal)
+{
+    int64_t val;
+    if (fread(&val, 1, sizeof(val), fh) != sizeof(val)) {
+        fprintf(stderr, "unable to read: %s\n", strerror(errno));
+        return defVal;
+    }
+    
+    return val;
+}
+
+static int read_header(FILE* fh, int* type, char** path, struct stat* st)
+{
+    *type = read_int32(fh, -1);
+    if (*type == TYPE_END) {
+        return 1;
+    }
+    
+    if (*type < 0) {
+        fprintf(stderr, "bad token %d in restore file\n", *type);
+        return 0;
+    }
+    
+    int32_t pathLen = read_int32(fh, -1);
+    if (pathLen <= 0) {
+        fprintf(stderr, "bad path length %d in restore file\n", pathLen);
+        return 0;
+    }
+    char* readPath = (char*)malloc(pathLen+1);
+    if (fread(readPath, 1, pathLen, fh) != (size_t)pathLen) {
+        fprintf(stderr, "truncated path in restore file\n");
+        free(readPath);
+        return 0;
+    }
+    readPath[pathLen] = 0;
+    *path = readPath;
+    
+    st->st_uid = read_int32(fh, -1);
+    if (st->st_uid == (uid_t)-1) {
+        fprintf(stderr, "bad uid in restore file at '%s'\n", readPath);
+        return 0;
+    }
+    st->st_gid = read_int32(fh, -1);
+    if (st->st_gid == (gid_t)-1) {
+        fprintf(stderr, "bad gid in restore file at '%s'\n", readPath);
+        return 0;
+    }
+    st->st_mode = read_int32(fh, -1);
+    if (st->st_mode == (mode_t)-1) {
+        fprintf(stderr, "bad mode in restore file at '%s'\n", readPath);
+        return 0;
+    }
+    int64_t ltime = read_int64(fh, -1);
+    if (ltime < 0) {
+        fprintf(stderr, "bad atime in restore file at '%s'\n", readPath);
+        return 0;
+    }
+    st->st_atime = (time_t)(ltime/1000/1000/1000);
+    ltime = read_int64(fh, -1);
+    if (ltime < 0) {
+        fprintf(stderr, "bad mtime in restore file at '%s'\n", readPath);
+        return 0;
+    }
+    st->st_mtime = (time_t)(ltime/1000/1000/1000);
+    ltime = read_int64(fh, -1);
+    if (ltime < 0) {
+        fprintf(stderr, "bad ctime in restore file at '%s'\n", readPath);
+        return 0;
+    }
+    st->st_ctime = (time_t)(ltime/1000/1000/1000);
+    
+    st->st_mode &= (S_IRWXU|S_IRWXG|S_IRWXO);
+    
+    return 1;
+}
+
+static int restore_data(const char* srcPath)
+{
+    int res = -1;
+    
+    FILE* fh = fopen(srcPath, "r");
+    if (fh == NULL) {
+        fprintf(stderr, "Unable to open source '%s': %s\n",
+                srcPath, strerror(errno));
+        return -1;
+    }
+    
+    inputFileVersion = read_int32(fh, 0);
+    if (inputFileVersion < FILE_VERSION_1 || inputFileVersion > FILE_VERSION) {
+        fprintf(stderr, "Restore file has bad version: 0x%x\n", inputFileVersion);
+        goto done;
+    }
+    
+    if (inputFileVersion >= FILE_VERSION_2) {
+        opt_backupAll = read_int32(fh, 0);
+    } else {
+        opt_backupAll = 0;
+    }
+
+    // The path that shouldn't be deleted
+    backupFilePath = strdup(srcPath);
+    
+    printf("Wiping contents of /data...\n");
+    if (!wipe("/data")) {
+        goto done;
+    }
+
+    printf("Restoring from %s to /data...\n", srcPath);
+
+    while (1) {
+        int type;
+        char* path = NULL;
+        if (read_header(fh, &type, &path, &statBuffer) == 0) {
+            goto done;
+        }
+        if (type == 0) {
+            break;
+        }
+        
+        const char* typeName = "?";
+        
+        if (type == TYPE_DIR) {
+            typeName = "dir";
+            
+            printf("Restoring dir %s...\n", path);
+            
+            if (mkdir(path, statBuffer.st_mode) != 0) {
+                if (errno != EEXIST) {
+                    fprintf(stderr, "unable to create directory '%s': %s\n",
+                        path, strerror(errno));
+                    free(path);
+                    goto done;
+                }
+            }
+            
+        } else if (type == TYPE_FILE) {
+            typeName = "file";
+            off_t size = read_int64(fh, -1);
+            if (size < 0) {
+                fprintf(stderr, "bad file size %ld in restore file\n", size);
+                free(path);
+                goto done;
+            }
+            
+            printf("Restoring file %s...\n", path);
+            
+            FILE* dest = fopen(path, "w");
+            if (dest == NULL) {
+                fprintf(stderr, "unable to open destination file '%s': %s\n",
+                    path, strerror(errno));
+                free(path);
+                goto done;
+            }
+            
+            int copyres = copy_file(dest, fh, size, path, NULL);
+            fclose(dest);
+            if (!copyres) {
+                free(path);
+                goto done;
+            }
+        
+        } else {
+            fprintf(stderr, "unknown node type %d\n", type);
+            goto done;
+        }
+        
+        // Do this even for directories, since the dir may have already existed
+        // so we need to make sure it gets the correct mode.    
+        if (chmod(path, statBuffer.st_mode&(S_IRWXU|S_IRWXG|S_IRWXO)) != 0) {
+            fprintf(stderr, "unable to chmod destination %s '%s' to 0x%x: %s\n",
+                typeName, path, statBuffer.st_mode, strerror(errno));
+            free(path);
+            goto done;
+        }
+        
+        if (chown(path, statBuffer.st_uid, statBuffer.st_gid) != 0) {
+            fprintf(stderr, "unable to chown destination %s '%s' to uid %d / gid %d: %s\n",
+                typeName, path, (int)statBuffer.st_uid, (int)statBuffer.st_gid, strerror(errno));
+            free(path);
+            goto done;
+        }
+        
+        struct utimbuf timbuf;
+        timbuf.actime = statBuffer.st_atime;
+        timbuf.modtime = statBuffer.st_mtime;
+        if (utime(path, &timbuf) != 0) {
+            fprintf(stderr, "unable to utime destination %s '%s': %s\n",
+                typeName, path, strerror(errno));
+            free(path);
+            goto done;
+        }
+        
+        
+        free(path);
+    }
+    
+    res = 0;
+        
+done:    
+    fclose(fh);
+    
+    return res;
+}
+
+static void show_help(const char *cmd)
+{
+    fprintf(stderr,"Usage: %s COMMAND [options] [backup-file-path]\n", cmd);
+
+    fprintf(stderr, "commands are:\n"
+                    "  help            Show this help text.\n"
+                    "  backup          Perform a backup of /data.\n"
+                    "  restore         Perform a restore of /data.\n");
+    fprintf(stderr, "options include:\n"
+                    "  -h              Show this help text.\n"
+                    "  -a              Backup all files.\n");
+    fprintf(stderr, "\nThe %s command allows you to perform low-level\n"
+                    "backup and restore of the /data partition.  This is\n"
+                    "where all user data is kept, allowing for a fairly\n"
+                    "complete restore of a device's state.  Note that\n"
+                    "because this is low-level, it will only work across\n"
+                    "builds of the same (or very similar) device software.\n",
+                    cmd);
+}
+
+} /* namespace android */
+
+int main (int argc, char **argv)
+{
+    int restore = 0;
+
+    if (getuid() != AID_ROOT) {
+        fprintf(stderr, "error -- %s must run as root\n", argv[0]);
+        exit(-1);
+    }
+    
+    if (argc < 2) {
+        fprintf(stderr, "No command specified.\n");
+        android::show_help(argv[0]);
+        exit(-1);
+    }
+
+    if (0 == strcmp(argv[1], "restore")) {
+        restore = 1;
+    } else if (0 == strcmp(argv[1], "help")) {
+        android::show_help(argv[0]);
+        exit(0);
+    } else if (0 != strcmp(argv[1], "backup")) {
+        fprintf(stderr, "Unknown command: %s\n", argv[1]);
+        android::show_help(argv[0]);
+        exit(-1);
+    }
+
+    android::opt_backupAll = 0;
+                
+    optind = 2;
+    
+    for (;;) {
+        int ret;
+
+        ret = getopt(argc, argv, "ah");
+
+        if (ret < 0) {
+            break;
+        }
+
+        switch(ret) {
+            case 'a':
+                android::opt_backupAll = 1;
+                if (restore) fprintf(stderr, "Warning: -a option ignored on restore\n");
+                break;
+            case 'h':
+                android::show_help(argv[0]);
+                exit(0);
+            break;
+
+            default:
+                fprintf(stderr,"Unrecognized Option\n");
+                android::show_help(argv[0]);
+                exit(-1);
+            break;
+        }
+    }
+
+    const char* backupFile = "/sdcard/backup.dat";
+    
+    if (argc > optind) {
+        backupFile = argv[optind];
+        optind++;
+        if (argc != optind) {
+            fprintf(stderr, "Too many arguments\n");
+            android::show_help(argv[0]);
+            exit(-1);
+        }
+    }
+    
+    printf("Stopping system...\n");
+    property_set("ctl.stop", "runtime");
+    property_set("ctl.stop", "zygote");
+    sleep(1);
+    
+    int res;
+    if (restore) {
+        res = android::restore_data(backupFile);
+        if (res != 0) {
+            // Don't restart system, since the data partition is hosed.
+            return res;
+        }
+        printf("Restore complete!  Restarting system, cross your fingers...\n");
+    } else {
+        res = android::backup_data(backupFile);
+        if (res == 0) {
+            printf("Backup complete!  Restarting system...\n");
+        } else {
+            printf("Restarting system...\n");
+        }
+    }
+    
+    property_set("ctl.start", "zygote");
+    property_set("ctl.start", "runtime");
+}