With conventional incremental backup, the main criterion for determining whether a file has changed or not since a previous backup is the file's modification time. However, there are cases where this criterion is not effective. For example, if a file has been renamed, moved to a new location, or if some of its attributes have changed, its modification time does not change. Consequently, the file is not always backed up in an incremental backup. Such files are backed up in the next full backup.

Enhanced incremental backup reliably detects and backs up also renamed and moved files, as well as files with changes in attributes. Enhanced incremental backup also eliminates unnecessary full backups of an entire backup object when some of the trees selected for backup change.

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