Not the OP, but I tried encrypting my files before uploading them to OneDrive. Microsoft did not liked that and was constantly bugging me regarding potential threats.
For the moment, lacking any better solution/knowledge, I put DIY encrypted cloud backups on hold (and went back to using iCloud which as far as I understand is encrypted, and as I’d rather not have MS nor Google constantly sniffing my personal files at all) but I will have a look at Hetzner offering. If it’s doable for a non-geek like myself to configure a Storage Box for automated backups, I may decide to use that instead. Being EU-based makes it a + as far as I’m concerned.