I've had to re-create my computer from "new build" four times since mid-December.
I have a single set of backups at the moment, but have been recently trying to come up with an organized backup schedule (including making a complete "image" of my computer so I don't have to start over from new the next time some d@mn worm makes it onto my computer!)
So right now, my answer is one. But I expect that to change in the next month or so as I figure out my official backup schedule.
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