Flickr isn't great for hardcore photographers with plenty of RAW images. They don't keep metadata and filenames of the originals, and you won't be able to upload RAW images.
I'm reasonably hardcore and find Flickr Pro fine--but for sharing and otherwise having them available online. It only functions as a backup in a "very worst case scenario" sort of sense. I use BackBlaze to store my Raw images (in addition to local backups).
Same. I think Flickr is a good worst case scenario backup. I still need to back up all of my RAWs somewhere. I work with s3 all day and will likely just write some scripts to manage my RAWs by hand. So far, I've just been lazy.
