This is my first time on this forum, so please do not "flame" me. I am a proud owner of an iMac 21.5" and have purchased an external G-Drive for all of my video/picture editing. This external hard drive works like a charm and is very user friendly, but i need to set it so that it will warn me about backups or if I can set it to backup manually. This is not a big deal, but it backs up about three times a day and these backups take up a lot of space on the drive. Any help will be greatly appreciated!