I’m having some trouble understanding how Bacula determines which files have 
been backed up, which ones haven’t yet been, and which files WERE backed up but 
need to be backed up again.

Maybe the best way to explain what I’m getting at is by asking specific 
questions. In this circumstance, I’m doing a full backup of an approximately 
23TB dataset to LTO6 tapes.

1) If, during the backup, a volume has an error and I want to “redo” the 
volume, can I simply remove the volume from the catalog during a tape change 
and expect that Bacula will rewrite whatever data was on the now missing volume 
to a new volume?

2) If not, and I just let the volume complete, then I remove the errored volume 
from the catalog after the backup is done, what happens to the files that are 
on the missing volume? Will Bacula “forget” about them, or do I have to remove 
the files separately?

3) If I manage to get Bacula to forget about the files on the volume with an 
error, and then do an incremental backup subsequent to the full backup, will 
the incremental backup contain the files on the missing volume, making a 
complete set between the full and incremental volume?

4) If I abort a full backup partway through, will Bacula retain knowledge of 
any files that were backed up prior to aborting the backup? Will a subsequent 
incremental backup then “complete” the backup set by picking up where the full 
backup left off?

Thanks for any light anyone can shed on this subject. I haven’t been able to 
find out too much information about what Bacula does when things go 
unexpectedly missing.

Yale

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