We record rehearsals every now and again. Usually when we have a couple of new songs on the go.
Normally use a mobile phone lying on a table somewhere in the room for a quick recording - often surprisingly good results considering...
We'll set up the zoom r24, micing all the amps, couple of mics on drums, after a few weeks once we are happy we have the arrangement down, to capture a copy for everyone to use in their own practice between rehearsals.