Right now I’m creating a nightly restic snapshot of my server on borgbase and on some spare drives, and keeping the snapshots forever. There’s a ton of daily churn in my data though, between databases and logs and other files that don’t constitute ‘real data’ but might be needed to restore the app.
I just
rsynca full backup of my NAS’s entire RAID array every week to a separate machine. I have Proxmox set up with an NFS mount to the NAS where it stores all of the/[userdata]volumes that my VMs and LXCs use; Proxmox itself is hosted on 3x office PCs, each with i7-7700/500GB SSD/32GB RAM, and set up for replication in case one goes down. On occasion I’ll actually document which services I’m using, so I don’t really bother backing those up since the volume(s) holding the userdata itself is backed up and can be easily remapped to a new instance of whatever service needs it.