On 05/12/2014 12:29 PM, Sven Tegethoff wrote:
> On 12.05.2014 11:56, ML mail wrote:
>> So my question here is: how do I need to configure bacula in order to 
>> restore files whenever during a 7 days period no matter if there is a full 
>> backup before available or not.
> You can't. Restoring from an incremental backup always requires ALL 
> preceding incremental backups AND the last full backup they are based 
> on. That means you retention period for all jobs
> must be at least twice as long as your frequency of full backups - 
> because a 7 day old job may be based on a full backup that is 14 days 
> old. And with your current configuration (incremental jobs, single 
> pool), even doubling the retention period would be submoptimal ... 
> because you would be carrying around up to 7 days worth of orphaned old 
> incremental backups.
In general, if you choose option 5 on the restore prompt, Bacula will
indeed want the Full and all the intervening Incremental and
Differential backups.  

However, it may not be well known, but one *can* restore just the files
from any given Incremental or Differential backup without the Full
backup.  You simply need to know the JobId of the Incremental or
Differential backup, and with a different option on the restore prompt,
you can enter the JobId and restore from it.  Also, Bat has a restore
that will work with all backups automatically and allow you to choose
any file in any backup. 

Doing restores from specific JobIds is perhaps a bit unusual but just
the same possible.

Best regards,
Kern
>
> I would suggest using not incremental but differential backups. A 
> differential backup only requires the job from the point in time you 
> want to recover, and the latest full backup job before that, but not any 
> jobs inbetween.
>
> Create two volume pools: One for full backups and one for differential 
> backups. Give the full backups a retention period of 14 days, and the 
> differential backups a retention period of 7 days. That way, you have 7 
> days coverage, and you only have jobs in your pool that you actually need.
>


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