Something that might help, I found this in the sendbackup file
(I wrapped it around with line breaks):

[snip] 
sendbackup: time 1626.684:  87:  normal(|):   DUMP: dumping 
        (Pass IV) [regular files]
sendbackup: time 3426.909: 112: strange(?): sed: couldn't write 
        43 items to stdout: Broken pipe
sendbackup: time 4964.241: index tee cannot write [Broken pipe]
sendbackup: time 4964.265: pid 2566 finish time Mon Dec  4 11:17:16 2006
sendbackup: time 4964.284: 112: strange(?): sendbackup: index 
        tee cannot write [Broken pipe]
sendbackup: time 4964.451:  87:  normal(|):   DUMP: Broken pipe
sendbackup: time 4964.472:  87:  normal(|):   DUMP: The ENTIRE dump is
aborted.
sendbackup: time 4964.476: error [/sbin/dump returned 3]
sendbackup: time 4964.476: pid 2564 finish time Mon Dec  4 11:17:16 2006