So I downloaded some free samples. Put them in a new folder on my M:S. Created a new project. Used the samples in that new project. Saved the project. Then I used Transfer to upload the used samples on my PC. Then I deleted them in the folder on my M:S. After that I copied the samples back from my PC to the M:S to a different folder.
And drumroll it works. My project is still working even though the samples are now in an other folder.
Still kinda scared to do it with all the other ones …