On 11/16/16 09:12, Paul J R wrote:
> Hi All,
> 
> I have a data set that i'd like to backup thats large and not very 
> important. Backing it up is a "nice to have" not a must have. I've been 
> trying to find a way to back it up to disk that isnt disruptive to the 
> normal flow of backups, but everytime i end up in a place where bacula 
> wants to do a full backup of it (which takes too long and ends up 
> getting cancelled).
> 
> Currently im using 7.0.5 and something i noticed in the 7.4 tree is the 
> ability to resume stopped jobs but from my brief testing of it I wont 
> quite do what Im after either. Ideally what im trying to achieve is give 
> bacula 1 hour a night to backup as much as it can and then stop. Setting 
> a time limit doesnt work cause the backup just gets cancelled and it 
> forgets everything its backed up already and tries to start from scratch 
> again the following night.
> 
> VirtualFull doesnt really do what im after either and i've also tried 
> populating the database directly in a way that makes it think its 
> already got a full backup (varying results, and none of them fantastic). 
> A full backup of the dataset in one hit isnt realistically achievable.
> 
> Before I give up though, im curious if anyone has tried doing similar 
> and what results/ideas they had that might work?



This is a pretty difficult problem.  To restate the problem, it sounds
like you are trying to create a consistent full backup, in piecewise
slices an hour or two at a time, of a large dataset that is changing
while you're trying to back it up - but without ever actually performing
a full backup.  The problem with this is that you need to be able to
keep state of a stopped backup for arbitrary periods, and at the same
time keep track of whether there have been changes to what you have
already backed up, and you don't have a full backup to refer back to.


The only thing I can think of is, is the dataset structured such that
you could split it [logically] into multiple chunks and back them up as
separate individual jobs?



-- 
  Phil Stracchino
  Babylon Communications
  ph...@caerllewys.net
  p...@co.ordinate.org
  Landline: 603.293.8485

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