Xfiles is an interactive utility for comparing and merging one file tree with another over a network.It supports freeform work on several machines (no need to keep track of what files are changed on which machine).Xfiles can also be used as a cross-validating disk<->disk backup strategy (portions of a disk may go bad at any time, with no simple indication of which files were affected. Cross-validate against a second disk before backup to make sure you aren't backing up bad data).