Re: [Bacula-users] Help with retention periods

Hi Florian,

About your incremental and differential retention periods:

1) incremental pool: you want to have daily volumes. The is Volume Retention = 8 days oversizing your backup window. I would suggest you to put it 6 or 7 days, but you have to consider the volume last written time and count the retention period from this value (we don´t know your backup run time).

2) differential pool: if you want to have 4 or 5 volumes in this pool (each one being used at the 2nd, 3rd, 4th and 5th sundays), you have to increase the volume retention period. 9 days is too short, you will get 1 or 2 volumes in this pool being recycled. So, I would suggest you to put here the same 34 days as full backups.

Regards,

Ana

On Thu, Jun 5, 2014 at 11:41 AM, Florian Baumgartner <bfloriang AT gmail DOT com> wrote:

Hey guys,

I'm currently looking into implementing a backup-cycle that takes daily incrementals, weekly differentials and monthly fulls (actually VirtualFulls in my case). The goal is to be able to restore a file in its daily state for a 'sliding window' of roughly one month.

My other goal is to recycle volumes as quickly as possible after they expire (to save diskspace and to have a somewhat constant count of volumes).

My main question is if the retention periods I set are sane for the goals I have in mind or if there are other catches I'm not aware of.

My schedule looks like:

Schedule {
Name = "WeeklyCycle"
Run = VirtualFull 1st sun at 20:00
Run = Differential 2nd-5th sun at 20:00
Run = Incremental daily at 23:05
}

Pool {
    Name = {{ hostname }}-Full
    Pool Type = Backup
    Recycle = yes
    AutoPrune = yes
    Volume Retention = 34 days
    Maximum Volume Bytes = 50G
    LabelFormat = "{{ hostname }}-Full-"
    Maximum Volume Jobs = 1
    Action On Purge = Truncate
    Storage = {{ storage_node }}
    Next Pool = "{{ hostname }}-Virt"
}

Pool {
    Name = {{ hostname }}-Incr
    Pool Type = Backup
    Recycle = yes
    AutoPrune = yes
    Volume Retention = 8 days
    Maximum Volume Bytes = 50G
    LabelFormat = "{{ hostname }}-Incr-"
    Maximum Volume Jobs = 1
    Action On Purge = Truncate
}

Pool {
    Name = {{ hostname }}-Diff
    Pool Type = Backup
    Recycle = yes
    AutoPrune = yes
    Volume Retention = 9 days
    Maximum Volume Bytes = 50G
    LabelFormat = "{{ hostname }}-Diff-"
    Maximum Volume Jobs = 1
    Action On Purge = Truncate
}

Thanks for your help!

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Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and their 
applications. Written by three acclaimed leaders in the field, 
this first edition is now available. Download your free book today!
http://p.sf.net/sfu/NeoTech

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