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View Full Version : Is this a reasonable back up speed?


Bagelturf
03-11-2008, 12:52 AM
I recently did a back up that took 11 hours -- much slower than I would have expected given my experience on Tiger.

Here is the info:
iMac 2.16 GHz Intel
260GB backed up
1.2M files
Destination is sparse disk image (encrypted 128bit) on 400MB FW drive

I did a smart update to an empty sparse image.

Does 11 hours seem reasonable? Would it have gone faster with a full back up?

dnanian
03-11-2008, 01:01 AM
Hard to say, actually... but we're really not significantly slower in our operation under Leopard: the only real "change" from a performance perspective would be that ACLs are being copied in the vast majority of cases.

So -- perhaps this is Spotlight indexing the drive while you're backing up?

Bagelturf
03-11-2008, 02:05 AM
Would Spotlight index the newly-created disk image?

I did not see any Spotlight activity, but then I wasn't looking for any either.

Does SD take any special action when it starts backing up to a disk image, such as setting the Spotlight status to off or the same as the disk is backing up?

dnanian
03-11-2008, 10:56 AM
It might, and we try to turn spotlight off and restore its state after... but that doesn't mean it always works as it should.