Tom Holroyd wrote:
On Wed, 2008-03-19 at 17:24 -0400, Tom Holroyd wrote:
Show of hands: compress backups? Or 1:1 copy.
Summary. More than 2:1 favor 1:1. If you do compress, compressing the
entire backup is bogus, it should be done file by file, and preferably
by the backup device.
The interesting news is backup verification. I typically look at the
file sizes and go, "yeah, it ran." Prob'ly not good enough.
Backuppc keeps only one linked copy for all instances of the same file
that appear - but full runs will replace any changed content. Even if
use rsync and tell it to cache it's block checksums to improve speed, it
will still compare a certain percentage of the stored file contents on
each run.
Also, one can argue in favor of FEC for archival storage, so if you lose
a track or set of blocks you can still recover. I backup to RAID.
I mirror the whole backuppc filesystem to disks that are rotated
offsite. I'd like to have something like the zfs incremental
block-level send/receive instead, though.
--
Les Mikesell
lesmikesell@xxxxxxxxx
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