hansbkk AT gmail DOT com wrote at about 09:35:49 +0700 on Friday, March 11, 
2011:
 > On Fri, Mar 11, 2011 at 3:46 AM, Michael Conner <mdc1952 AT gmail DOT com> 
 > wrote:
 > > That is good to know. Actually things are a little better than I thought, 
 > > the spare machine is Dell Dimension 2400 with a  Pentium 4, max 2 gb 
 > > memory. So I guess I could slap a new bigger drive into it and use it. My 
 > > basic plan is to get backups going to one machine and then dupe those to 
 > > an NAS elsewhere in the building. While we have a small staff, our 
 > > building is 62,000 sq ft with three floors, so I can get them physically 
 > > separated even if not really off site. For the web server, we have a two 
 > > drive raid set up with two spare drive bays. Besides backing up with BPC, 
 > > I would also dupe the drive on a schedule and take off site.
 > 
 > 
 > To expand on Jeffrey's comment below - the idea of "duping" your
 > backups is fraught with issues when the BPC filesystem gets past a
 > certain size.
 > 
 > To handle the creation of a redundant backup, I would advise one of
 > the following:
 > 
 > A - Periodically use BPC to run a full backup set to a different
 > target filesystem - this is simplest and quite likely the fastest, and
 > only becomes an issue if you have a limited time window - in which
 > case LVM snapshotting can help as Jeffrey mentioned.
 > 
 > B - use a block-level cloning process (like DD or its derivatives, or
 > Ghost-like COTS programs if that's more comfortable for you, to do
 > partition copying to a removable drive. Some use temporary RAID1
 > mirrors, but I don't recommend it.
 > 
 > C - a script included with BPC called BackupPC_tarPCCopy, designed to
 > do exactly this process.
I wrote a script BackupPC_copyPcPool that I posted to the list that
should be a bit more efficient & faster than BackupPC_tarPCCopy...

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