I'm adding backups to my crontab with crontab -e called as root. This brought up the editor and I entered: 30 05 * * * root pdumpfs /home/jim /mnt/backup-hdd/home/jim >/mnt/backup-hdd/homejim.log 2>/mnt/backup-hdd/homejim.errlog 00 06 * * * root pdumpfs /etc /mnt/backup-hdd/etc >/mnt/backup-hdd/etc.log 2>/mnt/backup-hdd/etc.errlog I'm trying to backup my home dir daily at 5:30am and /etc at 6am When I save+exit from the editor crontab says: crontab: installing new crontab "/tmp/crontab.3410":2: bad day-of-month errors in crontab file, can't install. Do you want to retry the same edit? I can't see the problem here. In both cases I have '*' as the day-of-month