An interesting observation, FlyingCelt regarding the Windows software and ports.
I would add though that you probably should not expect speeds to be anywhere near those found from the raw data speed tests. The software has other work to do which I would imagine maybe like this:
1) Index the file on the local computer;
2) Encrypt the file with your private key;
3) Compress the file;
4) Upload;
5) Decompress on the IDrive server;
6) Re-index the files on the Idrive server
Maybe some decryption too.
However, I would expect much the same process to take place whether you upload manually or use the software.
All, I can tell you honestly is that I have found that my backup speed is incredibley fast but it depends on the local computer.
All my computers share the same internet connection. My Linux server backs up at an incredible 15-30GB per hour depending on the type of data. My Windows 7 computer is a fraction of that.
The only think that is really slow is file syncing but that is dependent on the Win-dooze... computer.
So, I do not think this is a problem with IDrive.