found this on click here acronis forum
Error #1722 - "the RPC server is unavailable. (0xFFF0)
RPC server listed under Services
"Using XP, Vista, W7 by default there should be a Remote Procedure Call and a Remote Procedure Call Locator entry. Note they don't actually say Server, so this might be the cause of some confusion.
However, for TI to work RPC (the first one in the list, should be set to automatic and running, the other one is not used on most home PC's so can be set to manual)"