I found when I restored from the backup that in fact it was an incremental backup, and I had files from my last backup from the end of March. I left for a prototype build in S. Illinois right after that and didn't really author too many new files between then and now, so I'm not losing a lot - but I didn't know that when I came here in a panic.
Good to know you were able to restore a backup and didn't have to pay ransom. It would have been an awful and costly thing to do anyway. For all people reading this topic, here are a few links for future reference: