@aeva@mastodon.gamedev.place may not be the best suggestion but you can always pay a VPS provider and run your own nextcloud (or similar software) instance.
and/or encrypt your files before upload. you can't train on encrypted data even if you wanted to. veracrypt is the easy option i know of but almost any encryption works.
Queensborough (59th Street) Bridge, NYC, 2019.All the pixels, no congestion charges, at https://www.flickr.com/photos/mattblaze/48418025131#photography