Yesterday I ran an initial active copy from my desktop c: drive to my pogoplug external drive in about two hours for 42.5GB of data. The desktop pc was running Win XP SP3 and the network connection and ethernet adapter were all operating at 1Gbps full duplex.

Previously I downloaded and installed a free program called RichCopy which was recommended by Jon.QA of Cloud Engines on this forum, see link below. I tested it on a 45GB copy to pogoplug which it completed in just under 3 hours. The desktop PC was running XP and data transfer was over a 10/100 Mbps wired ethernet connection.

(Edited: the destination hard drive was connected to the pogoplug which was connected to the network in the normal configuration not to the PC !)

If you don't want to disconnect your drive from the pogoplug to make the initial mass transfer of files directly from the PC you could use RichCopy for the initial transfer then set up an Active Copy between your PC C: drive and your pogoplug external drive. RichCopy could do the initial  heavy lifting leaving Active Copy just do the file changes and updates.

http://www.pogoplugged.com/forum/thread/12297/Windows-7-Built-in-Backup/#6824

Remember, its not what life does to you, but what you do with what life does to you, that matters.