Adding folders/drives to Cloud Backup - does this work?

I have started my Cloud backup with a small part of the data I want backed up, and I have added more to it by modifying the options to include other folders. Can I keep doing this to add things, and will they then all be available for restore? I would much rather do this so I can prioritise what I need backing up (starting with the business admin files, followed by project files, followed by personal files etc.).

If anyone has a better way of approaching this then I would be interested.

If I delete a cloud backup settings and setup a new one, does it remove all the files so they have to be uploaded again or is it more intelligent than that?