I ran into a service called Bitcasa Bitdrive today. What I like about it is the fact that it is so easy to mount a Bitdrive as a folder on Ubuntu (they only claim to work with Ubuntu 13.04- but as far as I can see it appears to work just fine on my 64 it Ubuntu 14.10 server.
In many ways what they are offering is perfect - a large volume of securely encrpyted cloud storage which I can mount as a shared drive across all my servers. Quite apart from the fact that they got some bad press towards the end of 2014 the one thing that bothers me is that they impose a constraint of 5 connected devices. This is not an immediate concern but will soon be one since I would like the ability to read/write to Bitdrive from as many as 15 servers spread across the world. My searches for a service that offers similar functionality - encryption, large storage capacity and easy access as a mounted folder - have drawn a blank. Perhaps someone here might be able to suggest a few alternatives? Thanking you in advance.