[Dirvish] Number images x Disk Usage

[JT Moree]

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> Joel Franco wrote:
> The most complicated part I can think of (this is all off the top of my
> head, you understand; it bears further thought) is coming up with an
> algorithm for picking which backups to delete that makes sense.  Simply
> getting rid of the oldest wouldn't keep me happy, as I like to keep a
> monthly backup around for quite some time, and would be much happier to
> see a 12-day old daily backup get sacrificed than a 3-month old monthly
> backup.  My first thought would be calculate, for each backup, the
> percentage of the duration between creation and expiration which has
> elapsed and delete backups for which that value is the highest.

this guy has an interesting method.
http://www.math.ualberta.ca/imaging/rlbackup/

- --
JT Moree
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