PopStarWannabe
Thank you all for your solutions!
 
I decided to go on with the old drive but regularly save my projects as bundle files an upload these to online storage.
 

I'd recommend you start saving as .cwp-files (using Per Project Audio Folders-setting).
Bundle files can get corrupt, and in such a case the project is lost. In .cwp-format you can at least rescue the audio.
I wouldn't trust my projects to online storage only, I'd make hard copies in one form or another for myself, too.