Currently I'm using vps servers. Persistent data is kept in sqlite (single file). Backups are encrypted and sent to remote server. Restore requires pulling recent file and starting the account service again. In future if there is demand I think I will move to aws and use managed database.

Thank you for checking. Good to hear that it works. Regarding edge towers - I will observe/confirm it, and check in the code.

Regarding tower to fall - I confirmed in code - it is randomly chosen.