> Here my configuration of pools and shecules
> Pool {
>  Name = pool_incr
>  Pool Type = Backup
>  Recycle = yes
>  AutoPrune = yes
>  Volume Retention = 25 days
>  Label Format = "Incr-"
>  Volume Use Duration = 23 hours
>  Maximum Volume Bytes = 4G
> }
>
> Pool {
>  Name = pool_full
>  Pool Type = Backup
>  Recycle = yes
>  AutoPrune = yes
>  Volume Retention = 2 months
>  Label Format = "Full-"
>  Use Volume Once = yes
>  Maximum Volume Bytes = 5G
> }
>
> Schedule {
>  Name = "20:00-00:00-1"
>  Run = Level = Incremental mon-sat at 20:00
>  Run = Level = Full 1st sun at 00:00
> }
>
> My objetive is to have memory of a server only (and always) for 21 days,
> and full snapshots for 2 months. (1st January, 1st February for example,
> and February2-22 incrementals)
>
> What happend 23rd of February?
>
If there are no appendable tapes in the  pool_incr then bacula will
find a tape in that pool and recycle it.

The following link describes the procedure bacula will use to
determine what volume it will pick:
http://bacula.org/en/rel-manual/Automatic_Volume_Recycling.html#SECTION002530000000000000000

So if the volume that was purged was the same volume that had been
used for the previous 21 days bacula should upgrade that incremental
to a full on the 23rd. With that said I have seen a recent thread
where under some circumstances bacula does not do that and that it
will continue with an incremental  but since it removed the previous
incrementals you can not restore.

>
> Is differential backup my solution?
>
I believe this can work.

>
> Do you understand my explication? (sorry for my english)
>
I am a little confused at your reason for only holding 21 days of
incrementals max. I assume you have a limited storage.

John

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