Amicloud is offering a subscription for AmiCloud Pro and AEROS for Pi. The price is 5€/month (credit card only handled by What you get is:

5GB traffic free storage
Access to all AmiCloud clients for all systems
Access to AEROS Plus for the Raspberry Pi family
After 12 month a free upgrade to AEROS Premium (including free shipping)
Starting July 2016 the storage will be raised to 25GB for Pro users.