[CentOS] estimating backuppc

Wed Sep 17 04:42:50 UTC 2008
Spiro Harvey <spiro at knossos.net.nz>

> If we add hard drive storage for backups instead of buying LTO-3 tape
> drive, how much storage would we want for backing up 2Tb of binary
> data...surely not 6 Terrabytes?

assuming that three week rotation is full backups only, then 2x3 is
indeed 6.

However, most people do incremental backups daily and fulls once a
week. If this the case, you will need more.

Your backups will probably be compressing the files, or rather,
archiving them into tarballs, cpioballs, or whatever. However, JPGs and
most movie formats will not compress well as they are already
compressed very heavily. So a full 2G backup will likely cost you 2G. 

There are a lot of factors involved and there is a lot more to setting
up a good backup regime than figuring out how much disk to throw at a
problem. Come the first disaster, they won't be your customer any more.

Spiro Harvey                  Knossos Networks Ltd
021-295-1923                    www.knossos.net.nz

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