The transfer syntax is not supported by the RPC server

Hi,
I use my computer to create articles for publication. I had a bad experience months ago.
My hard drive crashes, that is why I learn my lesson well. I am now implementing some disaster prevention by having a daily back-up of all my files. On one occasion when I am about to back up my files, I did not succeed, there is an error "the transfer syntax is not supported by the RPC server".

System Protection
There was an unexpected error in the property page:
The transfer syntax is not supported by the RPC server.
(0x800706C2)
Please close the property page and try again.
I am wondering why, since I've been doing my back-up for almost a month now and there is no problem. I tried to reboot my computer and do the back-up again, same error message appeared.
I don't have an idea now on the error, please share some ideas, on what shall I do.
Thanks.
