Update: I let the usbdisk mount "naturally" instead of unmounting it & remounting it as /media/usbdisk. fstab automagically added the "tuesday" mountpoint, and when I reconfigured backup via the web interface, I was able to utilize it:
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[root@fs01 ~]# cat /etc/fstab
<snip>
LABEL=monday /media/usbdisk ext3 defaults
LABEL=tuesday /media/usbdisk ext3 defaults
LABEL=wednesday /media/usbdisk ext3 defaults
LABEL=thursday /media/usbdisk ext3 defaults
LABEL=friday /media/usbdisk ext3 defaults
/dev/sdb1 /media/tuesday ext3 pamconsole,exec,noauto,managed 0 0
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After running the backup, I have data!
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[root@fs01 ~]# du -h /media/tuesday
11G /media/tuesday/tmp_dir/enor-fs01.office
11G /media/tuesday/tmp_dir
4.0K /media/tuesday/enor-fs01.office/set1
8.0K /media/tuesday/enor-fs01.office
16K /media/tuesday/lost+found
11G /media/tuesday
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So, now the issue is: How can I get each disk to mount in the same mountpoint (for instance, /media/usbdisk) for an easy method of swapping backup disks daily? I am thinking of the days when I won't be in, but the disks will have to be changed out by office staff. Is it just an easy change in fstab?