Why does Mozy have to start the backup upload over if it's interrupted?

I sometimes close my laptop in the middle of a backup, and the upload process is stopped in the middle. When I wake the computer from sleep mode it forces me to restart the upload from the beginning. Besides being annoying, this seems wasteful of bandwidth.

There must be a way to resume the upload where it leaves off.
 
sad I’m interrupted
Inappropriate?
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