Back up your device without vendor lock-ins, using insecure software or root. Supports encryption and compression out of the box. Works cross-platform.

Open Android Backup Companion is the Android companion app, giving the backup script access to data otherwise not available to ADB. Open Android Backup is a tiny shell script & Flutter app that makes securely backing up Android devices easy, without vendor lock-ins or using closed-source software that could put your data at risk. It's based on ADB but doesn't use the deprecated adb backup command.

Data backed up:

• Apps (app data not included due to system limitations)
• Internal storage (pictures, downloads, videos, Signal backups if enabled, etc)
• Contacts (exported in vCard format)

SMS messages and call logs are also exported, albeit can't be restored.

Features:

• Automatically restores backed up data.
• Works on the 3 major operating systems, and supports any Android device.
• Backs up data not normally accessible through ADB using a native companion app.
• Tiny - the whole package is about 20 MB.
• Doesn't use proprietary formats: your data is safe even if this script ever gets lost. Simply open archives created by this script using 7-Zip.
• Backups are always encrypted along with their metadata.
• All data is compressed using 7-Zip with maximum compression settings.

For installation instructions (Linux, Mac, Windows) and usage instructions, head over to the project. This app cannot be used standalone yet, but such functionality is planned.