In a differential backup, the files that are already saved in a previous backup are skipped. That means only the new or changed files will be backed up. In a differential backup, all files changed since last backup with longer period are backed up. As an example, a differential daily backup does not backup files, if they are already contained in a weekly, monthly, quartal, semester or yearly backup. Stratesave supports differential backups for files and databases.
See also : Incremental backup