@Daniel > Are you able to link the two players directly with each-other? Are you able to link one single player to the computer? Have you disabled your firewall?
** Try reading through this post** and see if any of the tips there help you with the connectivity issues, if not, please post the questions asked at the bottom.
Regarding the restoration of the backup, I'm not sure why it fails - it could be the file is damaged? If you want to post it as an attachment here (if it's not too large for the system), please do so I can pass it to the engineers for inspection.