backup
Cameron Simpson
cs at zip.com.au
Wed Mar 19 21:33:45 UTC 2008
On 19Mar2008 17:24, Tom Holroyd <tomh at kurage.nimh.nih.gov> wrote:
| Show of hands: compress backups? Or 1:1 copy.
My choice? No per file compression. Let the storage substrate compress if
possible - eg modern tape drives do it on their own. Or if it doesn't, you
might compress the "archive of everything" file (eg a tar or dump file).
Otherwise you have to do "special" stuff on restore; it's untidy.
This position is a gross simplification of things of course.
Example: there are systems I backup with rsync to a new hardlinked tree from
yesterday's snapshot. Obviously this is 1:1, with incremental cost. It goes
to tape from an uncompressed tar file because the tape drive does some
compression.
--
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/
MS-DOS, you can't live with it, you can live without it.
- Lars.Wirzenius at helsinki.fi
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