I recently changed how I do job copy.  I used to do them all at once. 
and frequently.  Now I've moved to doing them in batches, once a day. 
All my incr, all my diff, and all the fulls.

   http://www.freebsddiary.org/bacula-disk-to-tape-via-sql.php

Why?  Less tape churn.  Previously, the copy-all-from-pool approach was 
mixing up different backup levels.  Thus, you might have an inc, diff, 
inc, full, inc, diff... resulting in several tape changes.  By running 
one copy job for just inc, then another copy job for diff, etc, the 
tapes churn less.

-- 
Dan Langille - http://langille.org/

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