Backups & Cloud Sync

Wammy provides two robust methods for protecting and transferring your reading library: automated Google Drive cloud synchronization and manual local backup archives.

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1. Automated Google Drive Cloud Sync

Wammy features built-in, zero-effort synchronization with your personal Google Drive account. Unlike manual exports, changes to your reading status, categories, and newly bookmarked titles synchronize automatically in the background.

Setting Up Cloud Sync

1. Navigate to More from the bottom dock.
2. Tap your Profile card or Cloud Sync.
3. Tap Sign in with Google and choose your Google account.
4. Grant the requested Drive AppData permissions.

How Google Drive Sync Operates

• Private AppData Folder: Wammy stores synchronization snapshots inside a private, hidden application container within your Google Drive. These files do not clutter your standard Google Drive folders and cannot be accessed by unauthorized third parties.
• Background Synchronization: Sync tasks execute via Android WorkManager during idle periods or when network connectivity is detected.
• Cross-Device Continuity: Log in to the same Google account on a secondary phone, tablet, or Android TV device to access your library, categories, and reading history across all devices.

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2. Local Backup Files (.tachibk)

If you prefer offline storage or need to migrate between different reader applications, Wammy generates standard .tachibk (gzipped Protobuf) archives.

Creating a Manual Backup

1. Navigate to More > Settings > Data and storage.
2. Tap Create backup.
3. Choose the backup destination folder via the system storage picker.
4. Select the components you wish to include:
   • Manga and novel library entries
   • Custom categories
   • Reading history and progress
   • Source tracking credentials
5. Tap Create. The generated file will be saved with a timestamped filename (e.g. wammy_2026-10-23_19-30.tachibk).

Restoring from a Backup

1. Navigate to More > Settings > Data and storage.
2. Tap Restore backup.
3. Locate and select your .tachibk file.
4. Wammy will parse the archive and display a confirmation dialog showing the number of titles, categories, and tracking accounts detected.
5. Tap Restore and allow the background restoration process to complete.

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3. Compatibility with Tachiyomi and Mihon

Wammy's local backup engine preserves schema compatibility with upstream Tachiyomi and Mihon backup files:

• You can import existing backups from Tachiyomi, Mihon, TachiyomiSY, or Komikku directly into Wammy without conversion.
• All tracked sources, chapter read flags, bookmarks, and custom category arrangements are preserved.
• When imported, Wammy automatically links entries to its native built-in scrapers whenever matched by source name or ID.

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4. Automatic Periodic Backups

You can configure Wammy to generate periodic offline backups automatically:

1. Navigate to More > Settings > Data and storage.
2. Under Automatic backups, set your preferred interval:
   • Every 6 hours
   • Every 12 hours
   • Daily (recommended)
   • Every 2 days
   • Weekly
3. Set the Backup limit (e.g., retain the last 5 backups). Older automated backups beyond this threshold will be pruned automatically to conserve storage space.