I use Apple Notes for a lot of important information, so I wanted to make sure I had backups.
Even though iCloud syncing is a thing, it isn't the same as a backup. It keeps your notes the same across all of your devices, but if you accidentally delete or change something, that change will sync too.
Apple does have some recovery options (like Recently Deleted), but there isn't a built-in way to automatically save snapshots of your Notes database over time.
If you already use Time Machine, it backs up your Mac, including Apple Notes.
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You can export individual notes as PDFs if there are only a few you want to safeguard.
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I wanted something that would quietly make a backup every so often, so I wrote a small open-source tool called Notehold.
It:
The project is here:
I mostly wrote it for myself, but I figured other people might find it useful too.