On: Photos Preview

[Someone]

My hope is on the can in "And with iCloud Photo Library, a lifetime’s worth of photos and videos can be stored in the cloud", but it wouldn't surprise me if that turns out to be a must.

[glhaynes → Someone]

Usage of iCloud Photo Library is 100% opt-in.

[frik → glhaynes]

Does it support alternative cloud solutions or common protocols like WebDAV, SCP/SFTP? Otherwise, it's all or nothing like with iOS8.

[glhaynes → frik]

It's like iOS 8 - you can either have your photos just locally or all in iCloud Photo Library.

Of course, being a Mac you could probably put that "local" photo library in a cloud service like Dropbox or iCloud Drive. Or use a separate app to sync photos to a cloud service.