You need to keep manually creating backups using Saved Games in case you need to restore. Depending on how much you play TPA will determine how often you create a backup.

As a general guideline:

There is no way to schedule a Saved Games backup in the game, so you will need to rely on other systems to remind you. You can use the DLC cycle as my memory jogger to create a new Saved Game restore point. This workaround is suitable until FarSight implements a better way of managing data.