There are incremental backups and full backups. Incremental backups (such as Windows 7 offers) are good if you may have several different versions of a file, and you want to go back to a particular version. But they gobble up disk space. I generally use a full backup, with backups of recently modified files. I just discovered that my sci-fi novel at some point lost the last several chapters, and all my backups are of the most recent (bad) version.
No, I was looking in the wrong directory!
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