I am running windows 7 64bit on a fairly new HP. I backup regularly to a 1TB Toshiba external drive. As drive space regularly decreases with successive backups, I would like to know whether backup drives are occasionally re-formatted to basically "start over" with the whole backup process. I rarely add new programs or games but I do see backup space decreasing steadily. Is this a common practice that is implemented to restore backup drive space?

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