Re: [Bacula-users] Disk backup recycling

[Marek S. <si...@np...>]

Hi,
I suggest to solve like this:
One Pool only. 8 volumes. Retention time 7 days and few hours. Use time 
1 day.

The use will be like this:
first Monday: full backup. volume 1 used and contains the full backup
Tue to Sun: diff backup using volumes 2 to 7 (automaticaly selected or 
created by bacula)
second Monday: volume 1 is not free yet, so using volume 8 for full 
backup. Now you have two full backups.
second Tuesday: volume 1 is available and bacula will recycle it for 
first differencial backup. Old full backup is discarded. Now you have 
full backup on volume 8, first diff on volume 1 and 6 volumes with 
useless data
second Wednesday: volume 2 is available etc.

You will not be able to keep the exact content of volumes in your head, 
but the bacula is designed for not needing that. You can still read 
every day's report and get your brain busy with it (and I recomand it 
for few weeks to catch the buggies).

Marek


Radek Hladik napsal(a):
> Hi,
> 	I am implementing simple schema for backing up our data. Data are 
> backed up to disk. Full backup is performed every Sunday. The next 6 
> days differential backups are performed.
> I want to keep only one Full backup and at maximum 6 daily differences. 
> The moment new Full backup is made, previous Full backup and its 
> "differential children" can be deleted. According to documentation 
> (chapter Automated disk backup) I've made two pools like this:
>
> Pool
> {
>    Name = full
>    Pool Type = Backup
>    Recycle = yes
>    AutoPrune = yes
>    Volume Retention = 7 days
>    Label format = full
>    Maximum Volume Jobs = 1
>    Maximum Volumes = 2
> }
>
> Pool
> {
>    Name = diff
>    Pool Type = Backup
>    Recycle = yes
>    AutoPrune = yes
>    Volume Retention = 7 days
>    Label format = diff
>    Maximum Volume Jobs = 1
>    Maximum Volumes = 8
> }
>
> But as I understand it, there will be two full backups as backups have 
> period 7 days and retention is 7 days too - so the last week backup will 
> not be reused as it is not old enough. But if I lower retention to i.e. 
> 6 days, the volume will be deleted before performing backup and there 
> will be window without any backup.
> I am backing up a lot of clients and I do not mind having one 
> unnecessary backup during backup process itself but I would like to 
> avoid having two backups for each client for whole the time.
> And my other question - can be differential/incremental backups 
> automatically deleted as soon as their "parent" is reused/deleted?
>
> Radek
>
>
>
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