Previous Versions is an incredibly useful feature built into Windows 7, which allows the OS to record and view earlier versions of files without a flux capacitor. Here’s a detailed guide to using this excellent feature.
This feature goes beyond the functionality of the Recycle Bin as it allows you to:
Recover files you may have permanently deleted.
View or restore a version of a file which you have saved over.
Allow you to compare current and/or previous versions of a file side by side.
With a little bit of dedicated hard drive space, an automation script and scheduled task, you can leverage this feature to guard against inadvertent file deletions and overwrites which traditional backups may not adequately cover.