Recommended that you do write 0's or completely reformat the hard disc and reinstall Windows at least twice a year. If you have to computers, you can network the two via a router, and do a system backup to the other computer.
The Back Up Files wizard backs up the most common file types. The following files are not included:
- System files (the files that Windows needs to run)
- Program files
- Files stored on hard disks that are formatted using the FAT file system
- Web-based e-mail that is not stored on your hard disk
- Files that are in the Recycle Bin
- Temporary files
- User profile settings
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