FYI – we have done an integration of Amazon and Vtiger to store Vtiger document files on Amazon. We use Amazon S3 which charges only $.03 per GB — that’s almost free. When someone creates a doc in Vtiger, it uploads to Amazon. If they open/download a document in vtiger it downloads from Amazon.
This works great if you have lots of big documents and you don’t want them to eat up all your server disk storage.