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 don’t host massive amounts of data. Just my contacts, calendars, grocery lists, rss feeds, that kind of stuff. All my pictures and movies are on my PC and backed up separately.