I am using Joplin for six months now and i have 2 notebooks that both are synchronized with onedrive, for use in pc and an android phone.
I would like to make an other notebook but i don't want it to synchronize with onedrive, i would like to have it only local in my pc.
Is there a way to do that? To have at the same time two notebooks synchonized and one local only in pc?
The current pre-release has the ability to run multiple profiles which you can swap between but each profile is essentially its own database so you won't be able to cross reference them or search in both at the same time.
It is a pre-release beta for a reason, there is always the potential a feature might be removed because of bugs etc. that can't be solved in the short term but so long as you keep your profile and data backed up properly then you won't lose any actual data.