First take on the first stage of the first test of the first online backup:
I am using the service recommended by a big computer store. (I'll give you names once we have the final results)
I started the first "save" at 8pm last night. The software told me there is about 4.5 Gb in my 'My Documents' file. When I checked at 5am this morning, around 18% had been saved.
The software warns that the first time this will take a few hours. My concern is that something will glitch on the home network and stop the save.