Almost exactly what I was planning to configure here Nils, with a couple of 
minor changes.  I was planning on taking 10 weekly backups since you 
occasionally get 5 week months, and depending on storage capacity, we're also 
considering annual snapshots.

I quite like Tim's idea of having 31 daily snapshots too.  We already have that 
for some of our data, so it might be easier to just use that globaly.

Our policy is likely to be:

15 mins:  keep 8
hourly:  keep 48
daily:  keep 14 (or 31)
weekly:  keep 10
monthly:  keep 24
yearly:  keep 10

For a default setup, I would have thought a years worth of data would be 
enough, something like:

15 mins:  keep 8
hourly:  keep 48
daily:  keep 31
weekly:  keep 10
monthly:  keep 12

Ross
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