Hi Arno
>>
>> i have to backup a nas system with a total size of 6,5TB. At this
>> time the nas system only has ~2TB of data that have to backup but
>> in future, the next two years data will be increase up to 6TB.
>>
>> I have installed Debian Etch on the nas system with samba und
>> bacula as backup application. I use a Sony StorStation LIB-81
>> autochanger with 7 200GB/520GB AIT4 tapes. In slot 8 there is a
>> cleaning tape.
>
> 7 slots à 200 GB is 1.4 TB. Adding compression (factor 2.6 is,
> typically, much too optimistic) you might end up at a bit above 2 GB.
I agree with you too that compression of factor 2 and more is fairly optimistic.
>
> That's obviously not enough space to handle a full backup of 6 TB.
Ok. I know that i could not backup all data without manual intervention. In
fact i have more than only 7 tapes to backup data.
Lots of data that i have to backup should only archive one or two years. these
files (mostly mpeg videos) are static and there are no changes. Therefore, it
is enough to backup these data once for archiving and place the tapes in safe
or any other secure place.
>
>> What is the best backup strategy for this scenario and how to
>> handle the tapes with bacula and the autochanger.
>
> You can run full backups only with intervention in between, which
> pretty much rules out unattended backups during the weekend.
What I imagine is... no intervention between monday and thursday because the
backup here should only save the changes of the files (incremental). At friday
afternoon a manual intervention is neccessary to do a full backup at weekend.
But i have problems or difficulties to configure the tapes in bacula. I read
something about the pools but i do not really understand how i should configure
the pools for my scenery.
In the user manual this is an example:
Pool {
Name = Full-Pool
Pool Type = Backup
Recycle = yes
AutoPrune = yes
Volume Retention = 6 months
Maximum Volume Jobs = 1
Label Format = Full-
Maximum Volumes = 9
}
Pool {
Name = Inc-Pool
Pool Type = Backup
Recycle = yes
AutoPrune = yes
Volume Retention = 20 days
Maximum Volume Jobs = 6
Label Format = Inc-
Maximum Volumes = 7
}
But i use barcodes, so the label of the tapes is allways different and start
without a "Inc-" or "Full-" phrase. In the users manual of bacula i do not find
something to handle tapes with barcodes in pools.
e.g. i would like use one pool of tapes for the daily backup, one pool for the
weekly full backup of all important files, one pool for the monthly full backup
of all files and one pool with the tapes that contains the archiving files.
>
>> I would like backup each day mo-do incrementally/differentially.
>
> That shouldn't be a problem with your setup.
>
> You should set up the necessary jobs and schedules yourself - or get
> commercial support if you don't want to. Examples are freely available
> here, advice too, but you should offer us a starting point, i.e. a
> configuration and any problems you encounter.
This is another problem. I do not really understand how jobs, jobdefs, pools,
schedule works together.
With jobdefs i can define a template that i can use in other jobs by reveral is
that right?
>
>> Each friday but the last friday of month i would like do a full
>> backup and even so the last friday of month.
>
> This will get difficult.
>
>> Is this a good concept for backup the data or has anyone here a
>> better suggestions.
>
> Basically, it's usable. Whatever strategy you implement should simply
> fit to your needs.
>
> If you want monthly full backups for archival, that can be done.
>
> Storing the full 6 TB during one weekend will more or less be
> impossible with your current equipment.
At this time there are no 6TB of data at the nas system. The full capacity of
the nas system is 6,5TB. Data will be increase year to year lots of data only
have to backup once for archiving. than the tapes can place in a safe or
something else. So this archiving can be carried out at one weekend.
Stefan
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