hi,
Wait how is it easy to hack?
It is very easy for a user to change the data (cheat) on playerprefs
online and offline
if you want it to auto save every hour you can use a wait and set it to 3600 and on the next state save the data you want to safe and loop back to wait.
You can add a global transition to it so you can also save on demand (end of level, or a save button for the player to press)