HI Capricorn
In previous versions, like AccountRight v19, having the one subscription entitled you to things like free phone support and access to the latest version. There were some additional features, specifically the M-Powered range, however these had a cost over and above the subscription itself for each file, service and in some cases transaction used.
Unlike AccountRight v19, in the AccountRight 201X range incorporates a range of live services, which includes STP reporting, as part of the subscription cost. Each subscription allows for live services on a single file. If you are wanting to use one or more live services on a file you will need a subscription for that file. Please note that live service entitlements are file specific, so you cannot split one subscription across multiple files to access certain live services
Storing the file on the cloud is just one of many live services. For a full list of live services, I recommend having a look at our forum post - Overview of Live Services