Okay, I've tested this and it DOES sync. However, like any sync program I think you need to be saving your numbers document to the iDisk app from the beginning.
You see, if MM is set to sync it has to know what to sync. Do you honestly want it to sync your entire Documents folder? I certainly do not. There is so much junk in there it is stupid.
Now, I made a text document and saved straight to my iDisk folder. I did NOT need to be online when I did that. I set my preferences (ABOVE) to allow me to access that folder when I am not online. I turned off my wireless internet and went to work. I updated. Once I turned the network back on it automatically sync'd because I told it to automatically sync (see above). Therefore, the second it sync'd all of my changes were made!
I'm actually glad that you cried wolf because it just made iDisk much more appealing to me. So thanks.
But hopefully, and while I know it's not ideal, but hopefully this works for you. While it may be nice to see something so damn intuitive that it will know what document you have in your iDisk documents folder and find it automatically on your Mac and sync it that way, esentially creating an automatic copy from say your Documents folder (desktop) to your iDisk Documents folder, I don't think MM is there yet and I doubt it ever will be.
I'd like your thoughts on this now after you try it yourself.
The first few posters say not. So who's right?!
Hey there tiger, I clearly went back and spent some time with this and revised what I was saying. So back up and once you weave through your poor attitude you'll find that as far as my responses go, they were far more helpful then your initial comment about something sucking because clearly you don't understand the app.