non-zero return status from tar

I get a return status of '1' after an apparently successful tar. Does anyone have any idea why? An errno of 1 is 'operation not permitted'. Here are the messages I get when running tar. None appear to imply "operation not permitted":

tar: Removing leading `/' from member names
tar: /var/log/backup/backup.080929: file changed as we read it
tar: /var/run/dbus/system_bus_socket: socket ignored
tar: /var/run/proftpd/proftpd.sock: socket ignored
tar: /var/run/acpid.socket: socket ignored
tar: /dev/gpmctl: socket ignored
tar: /dev/log: socket ignored
tar: Removing leading `/' from hard link targets
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jmarkfoleyAsked:
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joolsConnect With a Mentor Commented:
The error is not zero because of the messages, they look like they are just warnings and can be ignored.

I guess the backup.080920 is your backup log file which is being updated as the backup is progressing.
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jmarkfoleyAuthor Commented:
OK, I'll go with that.
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mchkorgCommented:
too late, but maybe --ignore-fail-read would avoid your 2nd err msg (file changed while reading)
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