On Fri, 2 Mar 2007, Bill Moran wrote:
> That "400G with compression" is just an average. There's no guarantee
> that you'll get 2x compression. Personally, I find it false advertising,
> but nobody's listening to me.
I tend to agree, especially now some makers are advertising based on 3:1
backup ratios..
I find that some LTO-2 tapes with only system and incremental backups
(mostly logfiles, configfiles, sources and binaries, highly compressable)
can get up to 700GB. IIRC one even topped 950GB (which I assumed must be
wrong, but subsequent checks verified there really was that much on it),
at which point I implemented "volume use duration" of 7 days.
On the other hand, various data partition backups full of compressed files
regularly only manage 205GB on the same 200GB LTO-2 tapes.
It really does matter what you're trying to backup.
If in doubt: ' tar - /path/to/root | gzip | wc ' vs
' tar - /path/to/root | wc '
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