If you use network storage for backups (AFP server) backup can get corrupted if the network goes down, and in most cases I have seen it is unable to recover and

If you use network storage for backups (AFP server) backup can get corrupted if the network goes down, and in most cases I have seen it is unable to recover and continue. You just have to delete the whole backup and start from scratch. This is why I use Vorta (Borg GUI) on macOS instead.