Why is my Mendix app that i built being reset (all info delated) after x days

I noticed that my apps that i built in the practische platform, local on my laptop are being erased without notice after x days. Why is this. How do prevent this. Its not a easy way for me to learn the application.
1 answers

What do you mean with erased? Erased from your local machine?

If so, thats not Mendix platform related.

If you mean the running app in the Mendix cloud (not the project and model), after 2 hrs the running app terminates and restarts automatically when your return to the running app