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How long has it been since you last tested your backups?
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Conquering Russia should be done steppe by steppe.
(Score: 2) by basicbasicbasic on Friday November 06 2015, @04:56PM
Having a single backup isn't something I'd recommend because, as you point out, it's really no better than mirroring. But most backup solutions do more than that.
I can only speak for Time Machine (the backup solution built in to OSX) but it does hourly backups for the past day, daily backups for the past month, and weekly backups for every previous week for as long as you have the disk space (mine go back to January 2013 when I first switched it on). It also lets you swap in multiple backup drives and will alternate backups between them if you have them connected at the same time.
If a file has become corrupted you skim back through the copies until you find the last good copy (it has a very nice interface for doing this).