[Users] Ploop Incremental backups strategy

[Kir Kolyshkin]

On 04/01/2015 05:22 AM, Simon Barrett wrote:
> Hi all,
>
> Is there any reason why I should not create snapshot a ploop-backed 
> container each day (or hour, for that matter) then merge all 
> outstanding snapshots at the end of the week (vzctl snapshot-delete) 
> and compact it?  This would allow me to do efficient incremental 
> backups to back up (using bacula, in this case) and I would imagine 
> it's a core use case.
>
> Are there any potential risks to be aware of (performance issues, 
> storage usage, corruption exposure)?

I am not aware of any, except a limitation of no more than 126 deltas 
mounted
(i.e. the distance from top to base delta should be < 127). If you try 
to hit the limit,
snapshot won't be created. So, hourly snapshots with weekly delete won't 
work, as
24*7 > 127.
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