All of the new software programs from Google have the functionality to transfer files from one computer to another. Some of these programs are great and that have the capability to send emails back and forth between your two computers. The problem with the Gmail program is that it doesn't have a feature to download files from another computer. What you would normally do when you need to get files from another computer is transfer them using an FTP program like FileZilla or Cyberduck. If you want to upload files you can use a file manager like Macromedia and also the built in Explorer.
There are several different ways you can transfer files from one computer to another, but when you are uploading large files you will find that transferring through FTP is the fastest and easiest method. When you first install Google Drive onto your computer, you will notice that there is a link to access it at the top of the Google homepage. By clicking on this link, you will be taken to the Google Drive setup page. At this point, you need to create a user name and password for yourself. You can set up an unlimited number of accounts, but there is only one limit on each account. Make sure that you use a unique password for each of your accounts.
You will then need to set up your two free accounts. The best way to do this is to go to the Google homepage and choose "Google Account Setup". Then follow the directions there to download the Google Drive program onto your computer. Once it is installed, you can start transferring files from one computer to another and you will find that by doing this, you will always have a backup copy of your files, no matter where you are in the world.