Synchronizing container directories alone is not a complete backup. Databases need consistent logical exports, while configuration, certificates, and attachments are good candidates for incremental rsync synchronization.

This migration mainly accomplished two things: first fixing the Docker port mapping failure on Debian 12, then migrating new-api from SQLite to MySQL. There were quite a few pitfalls along the way, especially iptables/nftables compatibility and SQLite to MySQL syntax differences.