Option for no sync a notebook to other device

I’m a great fan of Joplin. So I note everything I want to remember later. But a lot of this things are not usefull on my smartphone. Also some are very large because of pictures/attachments.

So I would like a Checkbox or something similar to a notebook to avoid sync - to my smartphone. Or in general to other devices? Perhaps sync to cloud should be done for easy backup purposes?

There are some options to discuss regarding the implementation efford. The target should be not to sync to a (small) mobile device.

This would be so useful.

I have a lot of material on my desktop that I don’t need on my phone.