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Re: [BackupPC-users] New backup server
2013-05-24 16:09:08
Erik Hjertén <erik.hjerten AT companion DOT se> wrote
on 05/24/2013 03:40:36 PM:
> Thanks for your thorough reply Timothy.
No problem. BackupPC (well, all system backup)
is a *lot* more complex than people think!
> About 8000 files a photos between 5 and 15 MB each, in total around
> 100 GB. This will perhaps explain the slightly size-per-file
> numbers.
15MB/file is perfectly manageable.
> There are a also few ISO-files around 7 GB, rest
is smaller files.
Large files are a hassle to back up. Period.
*BUT*: A file that doesn't change doesn't need to be backed
up more than once. So static ISO's are fine. (Or at least if
you change them infrequently.) What is a *major* issue are large
files that change frequently: daily database dumps, copies of running
VM disk images, etc. Each backup becomes a full backup, and it pretty
much destroys pooling. (Yet *another* thing to understand that I
didn't touch on in the original e-mail: how do your file size *and*
usage patters affect pooling? :) )
> I think now SATA drives will do the job. I'll
look into costs on
> different drives.
Depending on budget, I'd go with these: http://www.seagate.com/internal-hard-drives/consumer-electronics/sv35/?sku=ST3000VX000
The 3TB drives (what I use) are twice the price of
the 1TB, but you can *never* have too much storage! :) (But
then you get into the decision: would you be better off with 4 x
1TB than 2 x 3TB for *performance*? :) )
(And while I'm thinking of it: 1TB of total
space for 500GB of target backup space is... interesting. I assume
you want more than one backup for a time-based history? (I usually
default to between 12 and 16 copies to cover 120 or so days of time.) Yes,
BackupPC has pooling, but I would not want to put in a new solution that
has a significant amount less than 50% growth capacity on day one...)
Tim Massey
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