MarioC I'm aware of the main limitation of Timeshift on Solus
If you really understand this, I'm amazed that you would try to make a deprecated 2008 application run on Solus today. And I suspect that a friendly Solus moderator will soon come along and ask you to start a new thread, instead of resurrecting one from more than three years ago.
With that said, I'll suggest something that I discovered many years ago when I also asked about making Timeshift run on Solus. (I had also used it on other distros before I found Solus.) There's an excellent backup program in the Solus repository that is very simple to use. It's called Restic, and for years I've used it to perform a backup prior to every weekly update. And there are other occasions when creating a backup first makes sense, before you do something that's risky.
Not long ago I documented how easy it is to use in a post I made here.
I've never needed to restore a Restic backup personally, due to the care the Solus team takes with updates, but the person I wrote the above post for did just that, and happily confirmed that it worked just as it should.
