Lionel, Joseph, Matthias,
thanks for your additional hints towards Nextcloud service providers. :)
I'm still not decided because Nextcloud is way too much software for just needing a "network drive" with a bit of storage. And the extra software parts needs to be maintained somehow. If I'd be going for nextcould I would try to find a service provider that pays a bit to nextcloud.
As for the pure remote filesystem clouds my list is * https://internxt.com/drive (claims to have published Free Software https://github.com/internxt )
(not known if they run Free Software on the backend and frontend (if neeeded)) for the next three:
* hetzner.com/storage/storage-box * Strato Hidrive * Dt. Telekom Magenta Cloud
Suggestions for pure remote file storage (without Nextcloud or similiar larger software packages) are still very welcome. (As always in Europe and Free Software friendly.)
Regards, Bernhard