How much time for Time Machine's first backup?

Hello,
I recently bought a 2TB external hard disk. I partitioned into one disk of 500GB (for storage), and one disk of 1.5TB (for a backup with Time Machine).
It's connected with the Firewire 800 port of my Macbook Pro mid-2010.
I know the first backup is slow, but after 30 hours, it has only backed up 67GB, over the 270GB it has to backup.
I find this very very slow, even for a first backup! Is it normal?
Does it slow the backup if I use my computer in the mean time?
Does it slow the backup to have partitioned my external hard disk?
I already took some folders off the backup, deactivated Spotlight on the external disk, all I found on the web! But it's not going faster...!
Thank you a lot for your experiences / advices.

If you're doing a full backup (rather than an incremental backup), you'll have to copy 730 GB of files. If you only have 2 hours, that's 375 Gb/ hour or 106 Mb/ s, which is going to be more than a low-end NAS is going to be able to handle. If you have a 5 hour window, you'd be talking about 41 Mb/s, which is right about the disk I/O a low-end NAS.
At a minimum, you have to have enough disk bandwidth to handle the backup in your time window. In calculating your available bandwidth, make sure you account for the bandwidth other operations are using (i.e. if you are backing up to the same set of disks your database is running on).
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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