Back In Time is a backup application for Linux. It has versions that integrate favorably in GNOME and KDE SC 4 and is available directly from the repositories of many Linux distributions. Released under the terms of the GNU General Public License (GPL), it is free software.Back In Time uses rsync as backend and has the characteristic feature of using hard links for files which are identical in snapshots at different times, thus using disk space just once for files that remained unchanged.