That may sound stupid but all these google, dropbox and now backify services are so useless to me. Why? I sadly don't have the internet connection to upload 100

That may sound stupid but all these google, dropbox and now backify services are so useless to me. Why? I sadly don't have the internet connection to upload 100+gig on these servers. So, I can use dropbox for text files.. but the second I have to backup bigger stuff I really need to be cautious into not moving that into dropbox.