today, many cloud systems are available on the market like dropbox, google, sugar sync, or your local internet provider, you name it. Many of them offer some free gigabytes of storage.
Is there anything out there which can combine the storage into one usable folder (preferrably linux mountable) and encrypt the data stored in the cloud?
The basic idea would be to create one file per cloud used as a block device. Then combine all of them using a software raid (redundancy etc) with cryptFS on top.
Have you heard of anything which can do that or what can be used to build upon?"