The logic about backup seems quite flawed here. Buy a device to keep it at home vs. have Google or EMC store it for you? Safe to say, if there is a fire in my house, the computer AND the backup drive are goners. If I back up using an on-line service, their servers are backed up elsewhere too, so presumably, if they have a fire or an issue, your documents won't be gone forever. You may have temporary access issues, but the odds of it being gone forever are much smaller than keeping on your own computer...