On 26/05/2017 21:03, Michael Munger wrote:
Assuming the specified schedule, volume retention, and job retention...
is there a possibility that you can have a failed full backup on the 1st
Sunday that leaves you without /any /backup for 24 hours? (Previous full
Short answer - yes.
Longer answer - any backup regime that relies on everything happening
*exactly* some way is wrong.
To take you example, and make it worse: how do you compensate for a
longer than a forty-eight hour (i.e. weekend) power failure?
I am old fashioned[1], I have enough tapes for more than eighteen months
of the next five years projected use, with a requirement for twelve
months being live, and sending a full backup tape off site every month
for a three month holiday. (And I can always, FSOV always, buy more
tapes.) And I stash a full taken over the Christmas break as well, I
have copies going back a few years.
I would consider any short-rotation plan that did not have at least a
week of slack time as wasted effort.
Cheers,
Gary B-)
1 - Yes, Virginia, I did things with 9-track upright tape drives, and
DASD's the size of washing machines. ;-)
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