If you run the hack, chances are if you login and sync with your email address, the game developer side will detect the hacked values and reset your account to day 0. It’s happened to me, and many other folks.
its better that you enable the “Browsing Documents” option when signing the ipa, and backup the game data manually.
If you’ve been playing the game on the official AppStore version, and want to port your progress over to the hacked version, you could do a one-off login, retrieve your progress, then logout. Then install the hacked IPA (with “Browsing Documents” option enabled, and use the same App BundleID. Once loaded, run the game once, then back up the data files, delete and reinstall the game with the randomized App BundleID (to prevent Apple from detecting and banning your provisioning profile.
Thereafter, perform regular backups of your game data files.