Randy Katz wrote:

> I have a Full being created every month with a 3 Volume Retention and a 
> Time of 60d then there should never be a time when
> there is no Full before Diff/Incr's, right? 

Correct, but with monthly fulls you should set the time to 90-100 days.

> If I wanted a 180 day cycle 
> then would want to extend that to the incrementals and
> diffs as well, right?

yes.

When the volume carrying the oldest full backup expires, the subsequent 
diffs/incrementals are useless but leaving them in place won't hurt.

If you prune them all out immediately there's a possibility that the 
temporary increase in available volumes may result in you not spotting a 
need for more tapes/disk space as overall usage creeps up, until you 
need the things urgently. (It's a lot easier to purge a couple of 
volumes close to expiry than to have to hold up backups while waiting 
for more LTO5s to be delivered.)




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