rsync can do daily hard linked backups:

create the initial backup:
rsync -a /directory/to/backup "${backup_vol}/$(date +"%Y%m%d")"

run rsync in a nightly cron job:
rsync -a --link-dest="${backup_vol}/$(date -d yesterday +"%Y%m%d")" /directory/to/backup "${backup_vol}/$(date +"%Y%m%d")"

or if you want to just link to the last backup:
rsync -a --link-dest="$(ls -d "${backup_vol}"/* | tail -1)" /directory/to/backup "${backup_vol}/$(date +"%Y%m%d")"

3-5 more years to complete and they already have shirts with the logo on it. http://channel9.msdn.com/ShowPost.aspx?PostID=2679 5

Guess we know why Windows costs so much.