final feature set

tasks/config-persistence/27-config-file-backup.md

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+# 27. Implement Config File Backup on Update
+
+meta:
+  id: config-persistence-27
+  feature: config-persistence
+  priority: P2
+  depends_on: [config-persistence-26]
+  tags: [backup, data-safety, migration]
+
+objective:
+- Create backups of config files before updates
+- Handle config file changes during app updates
+- Provide rollback capability if needed
+
+deliverables:
+- Config backup utility
+- Backup on config changes
+- Config version history
+
+steps:
+1. Create config backup function
+2. Implement backup on config save
+3. Add config version history management
+4. Test backup and restore scenarios
+5. Add config file version display
+
+tests:
+- Unit: Test backup function
+- Integration: Test backup on config save
+- Manual: Test restore from backup
+
+acceptance_criteria:
+- Config files are backed up before updates
+- Backup preserves data integrity
+- Config version history is maintained
+
+validation:
+- Make config changes
+- Verify backup created
+- Restart app and check backup
+- Test restore from backup
+
+notes:
+- Backup file naming: feeds.json.backup, themes.json.backup
+- Keep last N backups (e.g., 5)
+- Backup timestamp in filename
+- Use atomic file operations
+- Test with large config files
+- Add config file size tracking
+- Consider automatic cleanup of old backups