I had backup problems this week.
I was upgrading my music server from Linux Mint 18.3 to Mint 20. (18.3 goes out of support next year).
I backup weekly (saving the last 10) to my NAS but to be extra safe I ran a “backup now” prior to installing the new OS and saved it on my NAS . It was a full backup of 6GB in a different folder to the scheduled backups.
I restored from the “backup now” but it was corrupted in some way. It kept saying that storage locations were unavailable and wouldn’t show my Qobuz albums either. I tried twice after totally removing Roon Server etc. It failed both times.
I then reinstalled Roon and restored from the scheduled backups. It worked first time. I made no other changes.
Mint 20 is good until 2025 for support thankfully. I don’t want to go through that again…