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-   -   Slow backup to external FW drive (http://www.shirt-pocket.com/forums/showthread.php?t=4496)

rhorer 08-27-2008 04:03 PM

Slow backup to external FW drive
 
I'm on a PowerBook G4 1.5GHz with 1.25GB of RAM. When I back up one Firewire drive to another Firewire drive with SuperDuper using the 'erase then copy' method, my average copy rate (as reported by SuperDuper) is just under 4 MB/s. When I use 'rsync -aE' from a Terminal.app command line to make that same copy, my speed averages around 18 MB/s. Why might SuperDuper be so much slower?

dnanian 08-27-2008 04:32 PM

Because rsync -aE isn't actually preserving everything in the file, in most cases. I think you'll also find that subsequent Smart Updates with SuperDuper! are significantly faster.

I haven't found that rsync vs. SD!, in overall speed once done (time elapsed), is that different -- it's possible, too, that the measurements are not entirely comparable.


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