BAK has various meanings in the File Extensions category. Discover the full forms, definitions, and usage contexts of BAK in File Extensions.
Backup is the most important computer term you should know. A backup is a copy of one or more files created as an alternate in case the original data is lost or becomes unusable. For example, you may save several copies of a research paper on your hard drive as backup files incase you decide to use a previous revision. Better yet, you could save the backups to a USB flash disk, which would also protect the files if the hard drive failed.
File ExtensionsLast updated: