yacdbak is intended to facilitate backups to multiple CD-recordables or CD-rewritables on Linux systems. It uses GNU tar and Jörg Schilling´s cdrecord.The initial version provides three shell scripts (<bindir>/yacdbak.full, <bindir>/yacdbak.diff1 and <bindir>/yacdbak.diff2) for different levels of backup. As the names suggest, yacdbak.full makes a full backup of all files specified by <sysconfdir>/yacdbak.include and <sysconfdir>/yacdbak.exclude. yacdbak.diff1 creates differential backups with respect to this full backup, and yacdbak.diff2 creates second-level differential backups. These scripts use snapshot files that can be found in <localstatedir>/yacdbak.