- backup_crypto.py: Fernet file encrypt/decrypt using the existing
SERVERKIT_ENCRYPTION_KEY (no new deps) — encrypt_file (-> .enc),
decrypt_file, is_encrypted_backup, encryption_available.
- BackupService: an opt-in `encrypt_backups` config flag; _finalize_backup
encrypts each artifact before _auto_upload (so the stored/remote copy is
encrypted) and records encrypted/path/size; restore_application and
restore_database transparently decrypt a .enc backup to a temp file first.
- 9 tests: byte-exact roundtrip, wrong-key failure, availability reflects
env, is_encrypted_backup, and an encrypted backup_files create+restore.
Notes: in-memory (streaming large archives is a follow-up); key loss =
unrecoverable backups (back the key up out of band). Additional remote
targets (WebDAV/Azure/Dropbox/SFTP) and restore drills remain follow-ups.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
