That then raises the question, how often you should delete backups
At what point does a backup become an archive? Once you get beyond 30-60 days, most people call it archiving. The GFS strategy is commonly used for archiving. The goal with backup is to have the most recent set of data available. (24 hours ago in most cases). Archiving is like a historical snapshot in time. Get backups first and if you have budget left over, archive.
It's pretty rare to use an archival backup. Usually only happens if you remember something was deleted a long time ago. Losing a years worth of patient encounters isn't really realistic.
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