Find a cloud storage provider that won't look through your files.
Nextcloud - Choose your hoster
Similar functionally to the widely used Dropbox, with the difference being that Nextcloud is free and open-source, and thereby allowing anyone to install and operate it without charge on a private server, with no limits on storage space or the number of connected clients.
Client OS: Windows, macOS, Linux, BSD, Unix, iOS, Android, Fire OS. Server: Linux.
Least Authority S4 - For Experts
S4 (Simple Secure Storage Service) is Least Authority's verifiably secure off-site backup system for individuals and businesses. 100% client-side encryption and open source transparency. 250GB for $9.95/month or 5TB for $25.95/month. Servers are hosted with Amazon S3 in the US.