Changing a rule or process in TM1 does not show up in the logs.
That is fine as long as you are the only Power User able to tinker with these objects.
Unfortunately, it can get out of hand pretty quickly as more power users join the party and make changes that might impact other departments data.
So here goes a simple way to report changes.

The idea is to compare the current files on the production server with a backup from the previous day.

You will need:

A luser just ran that hazardous process or spreading on the production server and as a result trashed loads of data on your beloved server.
You cannot afford to take the server down to get yesterday's backup and they need the data now...
Fear not, the transaction log is here to save the day.

Before running the following script you need to setup a chore with a TI process to execute that line in Prolog:

SaveDataAll;

/!\ Avoid using the SaveTime setting in tm1s.cfg as it could conflict with other chores/processes trying to run at the same time

here is the DOS backup script that you can schedule to backup your TM1 server