Move /var to msata partition

I already move /srv to my msata drive and created a /nas for user data store and exchange.
I still have an empty partition of 40G, is it still (with the latest version 5.1.7) a bad idea to move /var to this partition ? I have only 1Go of RAM and I want to have some log history (dmesg, messages, batch history). What is the correct move ?