Okay, so I learned that Timeshift on Manjaro does not backup al files in your home directory. Horrible. I've lost a lot of my preferences and some scripts. :(
Have to do this seperately with "Back in Time". Unbelievable.
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@ryo, it mentions this clearly in the setup wizard and allows you to override and include the home directory in the backup.

@artfulsodger Well, I must have completely overlooked that. I'll guess I'm not the only one.
That should be opt-out not opt-in.
What kind of nonsense is this not to backup the most important stuff?
Thanks for letting me know anyway.

@ryo, they clearly mentioned that it is a tool for system backups and not user data - https://github.com/teejee2008/timeshift#user-data-is-excluded-by-default. Since they also mention it in the setup process and allow you to override it, I'd say this is user error and not the tool's.

@artfulsodger Well, I never installed it. Timeshift was installed in my distribution by default, so I never saw that warning. Despite that, calling a backup program "Timeshift" and leaving out the most important part by default disqualifies this program as a serious backup solution.
And yes granted, they even say it that it's not a real backup program.
The name is what it implies if you know Timeshift from Apple which works great.