I also looked at the darwin sources to tar and saw that it supports a filename as in /usr/bin/gnutar -W -v -p -X /usr/local/bruconfig/gnuxpat -N /var/ backup/BACKUP-0 -cf /Volumes/External/BRUBackups/annie/ backup-20060304-3.tar / but this also results in a full backup. ie. it's not considering only those files that are more recent than the mtime of BACKUP-0 On Mar 4, 2006, at 10:10 AM, Robert Nicholson wrote: > It's actually using the following. > >> >> /usr/bin/gnutar -W -v -p -X /usr/local/bruconfig/gnuxpat -N >> 20060303 -cf /Volumes/External/BRUBackups/annie/ >> backup-20060304-3.tar / >> >> What's happening at the moment is that the above line is actually >> doing a full backup. ie. it's not considering the dates at all. >