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Re: [BackupPC-users] What file system do you use?
2013-12-17 11:43:12
Russell R Poyner <rpoyner AT engr.wisc DOT edu> wrote
on 12/17/2013 11:12:07 AM:
> This is a poor comparison since we have different data sets, but it
> would appear that BackupPC's internal dedupe and compression is
> comparable to, or only slightly worse than what zfs achieves. This
in
> spite of the expectation that zfs block level dedupe might find more
> duplication than BackupPC's file level dedupe.
It all depends on the type of files you're backing
up.
For my database and Exchange servers, I'd do bodily
harm for block-level de-dupe. Exchange is the *worst*: I end
up with huge (tens or hundreds of GB) monolithic files that are 99.9% identical
to the previous day's backup. BackupPC won't do me a bit of good
on those files, but block-level dedupe would.
However, with "normal" files, file-level
dedupe (like BackupPC) gives you a very high percentage of block-level.
Tim Massey
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