I came across this at Boardgamegeek - it’s a mid-game recording sheet. http://www.boardgamegeek.com/filepage/50674/aap40-mid-game-recording-sheet
You simply jot down the unit dispositions and other info and then you’re good to go after a few minutes of setup to continue your game.
Hope you find it useful.
Alternatively, you could use ABattlemap to record your mid-game information.
That’s what my group has done in the past when leaving the board up is impractical (i.e. not being able to get back to the game within a day or two).







