[CentOS] estimating backuppc

Wed Sep 17 04:48:29 UTC 2008
Craig White <craigwhite at azapple.com>

On Wed, 2008-09-17 at 16:42 +1200, Spiro Harvey wrote:
> > 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.
I understand this and I normally use bacula and am not familiar with
backuppc but I gather that guessing that 90% of the files will not
change in any given week, it will probably require less but I have no
experience with backuppc