Thanks a lot for you help! Generating download links would be an overkill. Since I have to deal with a managed Instance I cannot run code that isn’t in the app store to automate that. …
But fortunately I could manage to use the WebDAV API directly from the Browser. With this help I was able to pull the files. Additionally I added a Guest Account to create a read only user.
I agree, that In terms of performance this might not the best Solution, but I guess It’s ok for a start.