• 3 VMs in Proxmox hosting 70 containers get backed up everyday with ProxmoxBackupServer (VM in my primary NAS) to a NFS mounted folder on my primary NAS
• Primary NAS (with 7 containers) gets backed up with Snapshot replication to my secondary NAS everyday.
• Secondary NAS (with 7 containers) gets backed up with Snapshot replication to my primay NAS everyday.
• And once a month I backup my primary NAS (not the whole thing,only the important folders) to a USB drive that I store at a friends house.

I’ve been using watchtower for more than a year on all my containers and no issues so far. I have read many warnings against automating the updates, but it has never broken anything in my case. I’m talking about 3 VMs (on Proxmox) and 2 Synology boxes. 5 instances of watchtower keeping a total of 84 containers updated.

Nonetheless I try to play it on the safe side and make daily backups in case something breaks. I’ve had a couple of containers breaking (nothing related to watchtower, AFAIK) and I have recovered easily restoring the latest backup.