RemoteXY does not support storing data in the cloud; this feature is not provided and will not be implemented. This is the core concept of RemoteXY: all data is stored exclusively on your controller. As controllers become more powerful, this approach becomes increasingly feasible.
We are currently working on a control element that will store historical data directly in the controller's memory. In your case, this is just 6 * 2 * 365 = 4380 points, or 17,520 bytes of controller memory, which is very little. Additionally, this data will be buffered directly within the application.
Please let us know if this functionality would work for your project.

Not really, the data may be entered on multiple devices....

I want to develop a project that I can input up to 6 float data points, twice a day, and buffer them (with the date) for storage to a cloud server.

I will need to be able to retrieve any days readings, up to 1 year later.

My problem is not the data-handling, but how to go about the cloud storage. The WiFi to the cloud is not guaranteed in all measurement locations, hence the buffering.I can envisage only one days worth of data will need to be stored locally, and uploaded to cloud storage when WiFi is available.

Do I need to buy this cloud storage ?

Where can I learn the basics ?