well i had to buy another external HD for my backups, time machine, my 4+ year old seagate goflex gave it up, i tried everything but no success. anyway ive looked at the app. Time Machine Editor, seems that i can set it to backup daily, weekly or monthly. any one else using this app. if so you like it, dont like it. im doing so much that i need to backup every hour, or even every day. in fact i think once a week will do fine. by the way, i HD is 750 gb and my time machine is 2tb. i have 180gb on my internal HD. including VMware fushion.