[Dirvish] Archival storage of dirvish backup sets

[shouldbe q931]

On Thu, Aug 16, 2012 at 10:41 AM, Dave Howorth
<dhoworth at mrc-lmb.cam.ac.uk> wrote:
> Joe Aquilina wrote:
>> How do I work out which backups I can safely write to dvd/blu-ray and
>> then delete from the backup server?
>
> That's entirely a matter for your own discretion, based on your own
> business needs.
>
>> I have found a few places while
>> googling that mention that this can be done but without really giving
>> any detail as to exactly how this can be achieved safely.
>>
>> And once a backup set/snapshot has been written to dvd/blu-ray, what
>> is the best (i.e. safest) way of deleting it from the collection of
>> snapshots on the hard disc?
>
> You can just copy a particular snapshot to a disk in the same way you
> would copy any other files. Similarly you can just delete any particular
> snapshot using rm -r <snapshot-directory>
>
> If you configure dirvish properly, dirvish-expire will delete unwanted
> backups automatically.
>
> Don't forget that DVDs and Blu-rays don't last forever. You will need
> more than one copy and you'll need to rewrite them regularly onto new
> disks. I don't use them for backup myself, so I can't tell you how often.

if there is a need to archive, I use external/removable disks. I've
had far too many optical media die over the years to use them for
archive...