Apple

You might want to do a test restore just to make sure the disk in there is still good. A decade is a long time for a mechanical disk, and you might just be writing your latest files to the disk dutifully every day while bad sectors linger elsewhere on the disk.

Just saying... verify your backups. And I mean by doing a restore, not Apple's verify which doesn't actually check every byte.

It's usually good to have at least two backups anyway.