@Carnival-Boy said:
I'm going to have "actually, OneDrive is a backup" engraved on my tombstone. If you delete a file locally, or change it, you can restore an earlier version from OneDrive. The backing up is done at Microsoft's end, but it is still backed up.
Excellent. I was unaware that they were taking a full backup of that nature and not just a sync. Great to know!
Technically, I would say it as "OneDrive is backed up" rather than "OneDrive is a back up", but it makes it much closer.