[all variants] archfs / rdiff-backup-fs

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http://ubuntuforums.org – Hello.... I'd like to try archfs or rdiff-backup-fs (as I understand it's same) but can't figure the right command line. I make (test) backup with command rdiff-backup in-dir out-dir changed/deleted some files and make backup again few times. I was able to find "lost" files but it's hard to do. archfs is a tool to make that easyer but I don't know how to set up. I can't find any examples... just know the commandline to be rdiff-backup-fs <mount point path> <repository path> but don't understand parameters. can someone help me? Thanks (Hardware)