Script / Path to Export Data from FM Database to Dropbox or Copy.com?

I have a single database that I use to store contact information.

I currently have a script to export and backup all of the data as a raw text ".tab" file that is saved on the desktop.

(For script step for the path, I set a variable and the following to save to the desktop:

Get ( DesktopPath ) & "DataBackup.tab" 

Works great. But I want to use my database with FM Go, and then revise my script to save this "DataBackup.tab" file to dropbox, or to copy.com.

(Copy.com is much like dropbox but with more free storage.) 

The problem is that the path needs to be revised since you can't save a file to the desktop with FM Go and the iPad.

I need to change the path to the root dropbox or copy.com folder.

Also, I need this to be a variable so that if my brother uses this same database, it will properly save to his dropbox account/path from his iPad, etc.

Thanks.