On Tuesday 20 October 2009 16:34:10 Adam Williams wrote:
> I'm doing this because it's what management wants, to be able to restore
> a file from any backup, so the backups will have to span indefinitely.
> There are times when i've been asked to restore a file that was last
> touched by a user 3, 5, etc years ago and at some more recent point was
> deleted. And to carry that out, I'm asking if I have the proper
> configuration for that. I am open to suggestions on how often I should
> be doing full and incremental backups.
Hi Adam,
Storing indefinitely is only a disk capacity issue. The question is: to what
granularity do you want old backups kept? Do you want to be able to recover
the file 2 years, 3 months, and 2 days ago, and also the one 2 years, 3
months, and 3 days ago? If so you have no choice but to take a backup every
day and set retention to a very high level.
On the other hand, if it is acceptable to dailies for 2 months, and then
weeklies after that for 6 months, and then only monthlies - that can easily be
done with FullKeepCnt, FullKeepCntMin, FullAgeMax, and the Incr equivalents.
For instance, for my fulls I go back about 5 months, but in decreasing
granularity, with:
$Conf{FullPeriod} = '6.97';
$Conf{FullKeepCnt} = [ '4', '3', '4' ];
That is 4 weeks, then 3 period of 2 weeks, then 4 periods of 4 weeks.
But if you want just want dailies for 5 years, the settings would be:
$Conf{FullPeriod} = '6.97';
$Conf{FullKeepCnt} = '260';
$Conf{FullKeepCntMin} = '260';
$Conf{FullAgeMax} = '1825';
$Conf{IncrPeriod} = '0.97';
$Conf{IncrKeepCnt} = '1560';
$Conf{IncrKeepCntMin} = '1560';
$Conf{IncrAgeMax} = '1825';
This will actually keep files for longer (one day longer for each day the PC
misses a backup). You could set the KeepCnt, KeepCntMin, and AgeMax variables
to higher if you want longer.
Regards,
Tyler
--
"About astrology and palmistry: they are good because they make people
vivid and full of possibilities. They are communism at its best. Everybody
has a birthday and almost everybody has a palm."
-- Kurt Vonnegut, "Wampeters, Foma and Granfalloons"
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