There's a new version of Nephele WebDAV server (also on Docker Hub) that supports using an S3 compatible server as storage and encrypting filenames and file contents.
This essentially means you can build your own cloud storage server leveraging something like Backblaze B2 for $6/TB/month, and that data is kept private through encryption. That's cheaper than Google Drive, and no one can snoop on your files.
I do something similar with rclone and vultr's s3 service. I made an s3 remote in rclone and then a encryption layer remote on top of that.