Recently the place I work for hired a consultant to help us setup Bacula. He has been most helpfull and we have a basic setup working, but I wanted to start learning it since long term I will have to manage it. Pending boss approval I may still go and pester him some more in the near future. Just a matter of getting approval for the extra $$ :-)

So far I have not found the following on the docs:
* Difference between Full, Differential, Incremental in Bacula.
I know the concepts, what I am interested is how these work in bacula.

In particular I did a job/mod and changed a full to differental and then did an estimate. The estimate showed a number very close to what the full backup was. Does the estimate only works for full? Out of nearly 3 million files it's hard to imagine that they all changed since a full backup 2 days ago. :)

How does bacula determines what has changed? By date/time/md5?
Running bacula in FreeBSD (client/server)

* If I made a change to bacula-dir.conf is there a command to check the syntax is correct? The consultant mentioned that if the syntax is wrong that it may kill the bacula-dir (is that usually referred as the server?)

And if the bacula-dir did die, will running backups stop? * Does Bacula summits one transaction for each file to PostgreSQL? Any way to pool several files as to have them in a single transaction?



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