[ubuntu] Backing up folder too big for 8G stick

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http://ubuntuforums.org – Having successfully backed up two laptops, I turned to the main system and installed Deja Dup on that, and proceeded to backup my home folder( excluding various folders). As I now wish to upgrade from 11.04 to 11.10, and then to 12.04 (following the route I took with the laptops) I want to save the backup folder to an 8G memory stick bought for the purpose. Problem - the "Properties" of the stick show only 7.5G available, and the backup folder is 7.9G. How do I get "a quart into a pint pot" ? Is it possible/safe to store the backup folder across two sticks( I've g (Hardware)