Transfer User Manager database to external USB

Dear all, good afternoon !

I have almost 60 pcs RB960PGS on 6.49.17 and running there user manager (for hotspot).
Due to only 16MB of space i need a solution …
If i put on USB port a drive of 8GB, can i transfer there the database?
If yes how i can do it? Will be stable?



If I replace with MikroTik E50UG, hEX Routerboard, will be ok for my needs ?

Thanks in advance !