Editing Backup (section)

===Files===
*[[Copying files]]: Making copies of files is the simplest and most common way to perform a backup. A means to perform this basic function is included in all backup software and all operating systems.
*Partial file copying: A backup may include only the blocks or bytes within a file that have changed in a given period of time. This can substantially reduce needed storage space, but requires higher sophistication to reconstruct files in a restore situation. Some implementations require integration with the source file system.
*Deleted files: To prevent the unintentional restoration of files that have been intentionally deleted, a record of the deletion must be kept.
*Versioning of files: Most backup applications, other than those that do only full only/System imaging, also back up files that have been modified since the last backup. "That way, you can retrieve many different versions of a given file, and if you delete it on your hard disk, you can still find it in your [information repository] archive."<ref name="KissellTakeControlMacOSX" />