Impossible to save a project

Hello everyone,

I am using Audacity v 2.3.0 on windows 10. Whenever I try to save a project, I get an error message stating "Impossible to create a safety file : D:/Music/filename.aup.bak, (In french : “impossible de créer un fichier de sécurité”).

When I want to save under a new name, audacity tells me that the “file cannot be found”, which does not make sense since I am indeed trying to save as a new file…

Did anybody ever come accros this problem ?

Thanks a lot !!

What is the D:\ drive?