Dropbox is a similar app to Google Drive where you get free data to store. Like Google Docs, this has many uses. Millions of people have accounts and unlike Google Drive, this is used by many people and if you are downloading something, you may have to have an account. If you want a Dropbox account, you may have to install it on the device. Also, you can get 50 Gigabytes for free(you need to do a few minor tasks). That is 50 trillion bytes. You might be able to use that much data in a year and a half minimum if  you use it constantly. For contrast, my Samsung Galaxy S4 mini has 12 gigabytes. Baloons Tower Defence 5 paid for mobile(my biggest app on my phone) is 141 megabytes. There are one thousand megabytes in a gigabyte. For a computer you can upgrade to a terabyte()