Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; nl-nl) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5) So i was thinking about backing up my imac through time machine. Howmany gb would i need? I have an 1tb imac wich i never let go past half full. (moslty around 600gb free) and i will expand later with an xtra macbook. So... Howmany storage would i need for a decent backup?