Scheduled backup being "prevented"?

[Ken D'Ambrosio]

Hi, all.  Our backups kicked off last night, as usual, but something weird cropped up.  One of our disklist entries didn't back up.  If an out-and-out error had occured, I'd probably be okay with it, but noooo...  Instead, we got the following:

(From amstatus)
nebula:CAD-BACK                1 planner: [no estimate]
(From different places in the same e-mailed report)

nebula     CAD-BACK lev 1 FAILED [no estimate]
planner: Preventing bump of nebula:CAD-BACK as directed.
Why the heck would we get "no estimate?"  Why would it say "Preventing bump... as directed"?  I'm mixed up, here.  Our disklist entry looks fine, but I've included it, below, for perusal.  Barring a different path and diferent include/excludes, it's identical to many other of our disklist entries.

Thanks for any insights...

-Ken

# IC Engineering directories CAD & BACKUPS
nebula CAD-BACK /mnt/raid0/servers/sol/shared/IC_Engineering {
       nebula-user-comp-tar
       include "./BACKUPS" "./CAD"
       } 1