If you care about encryption I’d recommend Ente. They have guides for migrating from Google Photos.

I was initially just doing local backups but I decided I wanted something offsite and Ente has been great.

There’s also Immich which is very similar to Google Photos in terms of features, and NextCloud which is a whole cloud suite. These aren’t encrypted by default though so if you use a cloud provider they could realistically also scan through your photos.