Walt Mankowski on 17 Jul 2010 08:04:23 -0700

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Re: [PLUG] How do you backup your home PC's / Laptops?

On Sat, Jul 17, 2010 at 09:47:22AM -0400, Amul Shah wrote:
> On a Mac OS X 10.5+ machines, I use TimeMachine which you can trick
> into using an Ubuntu server as the remote backup.  Otherwise an
> attached external FireWire (USB works but is dog slow) is the way to
> go.  Prior to 10.5, I used CCC (aka Carbon Copy Cloner) which is the
> equivalent of rsync that makes the backup disk bootable.

While the transfer is slow, the actual process of deciding what needs
to be backed up is fast because OSX tracks which files have been added
or modified.  (I assume this is a feature of HFS+, but a quick google
didn't turn up anything.)  What this typically means is that the first
time you run Time Machine it takes hours, but the hourly incremental
backups that run after that generally only take a minute or two.

In contrast a backup of an ext3 partition has to recursively look
through the entire partition each time it runs.  I use rdiff-backup to
backup about 50 gb to an external usb drive and it takes about 40
minutes to do an incremental backup.


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