network speeds over time..

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I was wondering if anyone could shed some light on a network speed issue. we
have a database to backup that's 766GB. at first the backup starts off
pretty well at 30MB/s but over time it just keeps getting slower and
slower... towards the end it ended up under 10MB/s

I have tried different methods of copying the file and it doesn't seem to
matter the performance degrades over time regardless.

its obviously hard to give info on this, but I was wondering if this was a
known issue and if there was any way around it. typically restarting the
copy helps with the speed, but that really isn't the best option.

what would cause the speed to drop?

Thanks
Justin


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