MuntashirAkon/AppManager · error · BackupException

Could not get internal data backup.

Error message

Could not get internal data backup.

What it means

backupData() collects the internal data archive (<packageName>.zip, crypto-named) from the backup location when the destination metadata's flags request internal data backup. If findFile() cannot locate it, the FileNotFoundException is wrapped into this BackupException. It means internal-data backup was requested but the source zip is missing.

Source

Thrown at app/src/main/java/io/github/muntashirakon/AppManager/backup/convert/OABConverter.java:304

        // Overwrite with the new files
        try {
            sourceFiles = mBackupItem.encrypt(sourceFiles);
        } catch (IOException e) {
            throw new BackupException("Failed to encrypt " + Arrays.toString(sourceFiles), e);
        }
        for (Path file : sourceFiles) {
            mChecksum.add(file.getName(), DigestUtils.getHexDigest(mDestMetadata.info.checksumAlgo, file));
        }
    }

    private void backupData() throws BackupException {
        List<Path> dataFiles = new ArrayList<>(2);
        if (mDestMetadata.info.flags.backupInternalData()) {
            try {
                dataFiles.add(mBackupLocation.findFile(CryptoUtils.getAppropriateFilename(mPackageName + ".zip",
                        mSourceCryptoMode)));
            } catch (FileNotFoundException e) {
                throw new BackupException("Could not get internal data backup.", e);
            }
        }
        if (mDestMetadata.info.flags.backupExternalData()) {
            try {
                dataFiles.add(mBackupLocation.findFile(EXTERNAL_FILES).findFile(CryptoUtils.getAppropriateFilename(
                        mPackageName + ".zip", mSourceCryptoMode)));
            } catch (FileNotFoundException e) {
                throw new BackupException("Could not get external data backup.", e);
            }
        }
        String tarType = mDestMetadata.info.tarType;
        int i = 0;
        Path[] files;
        for (Path dataFile : dataFiles) {
            files = new Path[]{dataFile};
            // Decrypt APK file if needed
            try {
                files = ConvertUtils.decryptSourceFiles(files, mSourceCrypto, mSourceCryptoMode, mBackupItem);

View on GitHub (pinned to 0152f468fc)

Solutions

1. Copy the <packageName>.zip internal-data archive into the backup root (with the correct crypto-transformed name if encrypted).
2. Re-create the OAndBackup backup including internal data before converting.
3. If the source has no internal data, adjust the converted backup's flags so backupInternalData() is false (e.g. external-data-only conversion).
4. Verify mSourceCryptoMode and mPackageName match the on-disk zip name.

Example fix

// before: flags request internal data but backup dir has only the external zip
// after: place the internal zip in the backup root
//   backup/com.example.app.zip   <- internal data
//   backup/external_files/com.example.app.zip
// or clear the internal-data flag before conversion

String internalZip = CryptoUtils.getAppropriateFilename(packageName + ".zip", sourceCryptoMode);
if (destFlags.backupInternalData() && !backupLocation.hasFile(internalZip)) {
    throw new IllegalStateException("Internal data zip missing: " + internalZip);
}

try {
    converter.convert(...);
} catch (BackupException e) {
    if (e.getMessage().contains("internal data backup")) {
        Log.e(TAG, "Internal <pkg>.zip not found; adjust flags or restore file", e.getCause());
    }
}

When it happens

Trigger: backupData() (called from convert()) executes mBackupLocation.findFile(CryptoUtils.getAppropriateFilename(mPackageName + ".zip", mSourceCryptoMode)) and throws FileNotFoundException at OABConverter.java:304, while mDestMetadata.info.flags.backupInternalData() is true.

Common situations: Source backup contained only external data (or only the APK), so no internal-data zip exists; the zip was deleted; wrong mSourceCryptoMode yields a wrong expected filename; the package name used for lookup differs from the zip's actual prefix.

Understand the failure class

Background: "File not found" and ENOENT errors: why libraries can't find a file that should exist — this error's family across 50 libraries.

Related errors

• Destination doesn't contain any data files.
• Could not get backup files.
• not found at
• Could not get metadata file.
• Destination doesn't contain any APK files.

AI-assisted analysis of MuntashirAkon/AppManager@0152f468fc (2026-09-12). Data as JSON: /api/errors/6d3cc080f0dc1ed9. Report an issue: GitHub.