I know what you mean - I save a copy each time I close per @KenDuckySmith instructions, and it works, although my game crashed about 20 minutes ago and I had to use the saved file which means all I have lost is any gifts sent in the last 90 mins! The new code they send you will only work once now.craaaap! The game crashed again and the restore code I have from August doesn't work... need some time to request the code from GI. Honestly, I wish to think about continue playing... Then I will probably contact GI...
Keep smiling!
GAME CRASH TACTICS
DAILY INSTRUCTIONS
1) Open file explorer, click on the view tab and just to the right of the header ensure the box, Hidden files or items is checked.
2) You can manually save the game each day if you feel comfortable with that, by going to: This PC. Click on C/users/username/AppData/Local/Packages/xxxxxxAirportCityxxxxx/LocalState
3) In this folder there is a SaveGame.bin file. Copy and paste it, preferably on another drive, SDCard, Thumb drive, but not on the same drive you are using for OS. Note that again unless the hidden items box is not checked under the view tab, a user cannot see the AppData folder.
4) If you save a shortcut on your desktop, it is eveen easier.
RECOVErY INSTRUCTIONS
1) If your game should happen to crash and revert back to level 1, all you need to do is get the game to level 5 first, close the game and the LocalState folder is created along with the first SaveGame.bin file.
2) Go to where you saved your own bin file earlier, copy it and paste it into the LocalState folder, replacing the one already there.
3) Open the game once again and you should be right where you left off.