I dont think Ive ever finished JA2 just because every time I am doing a playtrough at a certain random moment the game WILL crash and suddenly Ive lost hours of progress.
And then it happens a couple more times and I have no desire to play the game anymore.

Skip ahead a year or so Ill try JA2 again but start a new game and play a lot till another crash screws me over again.

SO SAVE A LOT!! I mean literally after every battle or movement you've made or you will be replaying a lot of battles.