You have always been able to ftp files up and down from your gmail account:
http://lifehacker.com/software/gmail/store-files-with-gmail-file-space-141833.php
Now, you can get extra storage to do this:
http://www.marketingpilgrim.com/2007/08/google-offers-cheap-online-file-storage-with-a-catch.html
So, if you are only looking for a server so you can access your files anywhere in the world, you can use gmail for free, and add extra storage for fairly low prices.
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