Yeah getting them an easy interface would be the hard part. Perhaps google drive and a posix mount then use a cron job to move it to the external library?

Couldn’t you use immich external library? The only thing after that is a wayto upload sftp, email monitoring, web upload, or syncthing? Could do multiple options of these.

Netdata may be an interesting service for you. It monitors everything on your system(s) and has alerts for more than just outages.

I just bought 3 HP EliteDesk 705 G4 the other day starting a kurbenetes cluster.

Currently I am using my desktop for Plex due to storage. I got a 42U APC rack with one mini pc for kurbenetes for my other services.