So I have all Dropbox files on my iMac and can I reach these files by the dropbox on my macbook air with online. It saves a lot of needed memory
Hi there, @blueLion, and happy Friday!
You can absolutely have different settings for your files on different computers, even if it's the same Dropbox account.
The feature that helps you make your files online-only is computer specific, so you can have different settings on different computers.
I hope this helps, but let me know if you need anything else.