jk04 AT alpha.net DOT au wrote:
> Hi
>
> I am backing up a server with a lot of static content and very little
> dynamic one. I would like to have , on any given day, a full backup for
> the past 30 days but am not sure how to choose a proper schedule. The
> directories are backed up onto a disk partition which I suppose give us
> a good degree of flexibility in selecting any number of volumes and/or
> any combination of full, incremental and differential archives.
Just, monthly full, weekly differential and daily incremental .. but any
random choice would depend on:
* Whats the level of "granularity" you want on your backups?
- E.g should a file written and deleted X hours later be backed up?
* How much disk space do you have available for you backup.
- A full backup will fill roughly the same amount as on the other end?
The level of granularity will set the frequency of all your backup runs.
If you need to have a file written and deleted 12 hours later, you need
to run backup twice a day. (at least).
Differential runs, can save disk-space on your storage system, but will
sacrifise you granularity.
Say you retention times (on the above schedule) is 2 months for full
backups, 1 month for differential and 2 week for incrementals. Then you can:
* Within the last week restore to a granularity of 1 day
* Within the last month restore to a granularity of 1 week
* Within the last 2 months restore to a granularity of 1 month.
Play around with the numbers and figure out what you need.
Jesper
--
Jesper
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