[nycbug-talk] off site backup
Sun Oct 30 11:53:25 EST 2005
On 10/30/05, Francisco Reyes <lists at natserv.com> wrote:
> On Sun, 30 Oct 2005, Jerry B. Altzman wrote:
> > What do people do to test/verify their backup sets?
> It depends what you use.
> If you rsync/unison somewhere you can do mtree of the directories after
> the rsync/unison.
> > Hands up of those of you who've been bitten by the "corrupt/missing backup"
> > problem.
> If you truly want to be sure... test restores are probably the best
> measure.. Just because you make sure the file exist on the other location,
> doesn't mean the file is actually good. It could have been corrupted even
> before it was copied to the second location.
this raises an interesting question, for me at least. I'va had bad
tapes in the past that I have been able to recover from, minus some
missing data - but I was still able to dd the archive off the tape for
testing and eventual recovery. how do people do this on a drive, when
say after a year or two of shelf life the disk itself is not spinning
up or some blocks get curropted? this is pretty much why I still
don't trust using an IDE HD based backup solution...heck I'm not even
sure I'd trust a SCSI HD solution if it was affordable...
NYC's *BSD User Group
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