I think you know, hence the wink, but usually what happens here is the local copy is lost and the backup has been bad for ages, but never was identified. The lesson learned is to test your backups, which is kind of a pain.

While I do keep a single drive backup, to restore my entire drive from, but I do not test this backup. If it doesn't work, it's not that big of a deal. I cherry pick what I really find important and burn it to M-DISCs. Very little content is actually that important, baby photos and things like this.