Pretty severe -- ADP allows users to store data with e2e encryption.

Disabling ADP is a pretty serious* thing to do -- and pretty disappointing since I was interested in the product. Since it's OSS though this might be something that can be worked around in the future.

Thanks for confirming my hunch. I'd be surprised if it would be possible to work around this.

That’s a good question. To be completely honest, I don’t know much about Advanced Data Protection myself, and I didn’t do anything specific in the app to detect or interact with it.

I’m actually curious: how did you discover that it doesn’t work when Advanced Data Protection is enabled? Was it through an error message, incomplete backups, or something else you noticed?

I did not discover it, disabling ADP is listed under "iCloud Prerequisites" on the/your GitHub page.

The app that the person you're replying to ('gerdemb) created (Photos Backup Anywhere) is different than the open-source CLI tool that is the HN submission (icloud_photos_downloader).

Aha, thanks. That's good to know.