I have several computers that I use with Proton, an Office Desktop, a Lab/Workshop Desktop, a Linux machine, a Laptop, etc. I use Proton Drive main for backups with a small set of shared files. I DO want all devices to sync every file, it would be SO much better if I could set up folders that would only be sync'd on specific devices.

For example:

Office (only sync'd on the office computer)
Workshop (only sync'd on the workshop computer)
Laptop (only sync'd on the laptop)
Windows (only sync'd on the Office, Workshop, and Laptop computers)
Linux (only sync'd on the Linux computer)
Shared (sync'd on ALL computers)
Backups (NOT sync'd on any device - manually uploaded/downloaded)