Developer Justin Williams on his personal blog:
This is 2014. This doesn’t seem like a a problem that still needs solving, yet we still don’t have a de-facto platform for private and semi-private photography sharing and backup.
Justin’s been burned twice with photo services that have shut down; once with Everpix (ran out of money) and once with Loom (now acquired by Dropbox).
He’s come to many of the same conclusions I have about reliability of photo storage, and gone with a big, stable company for this job. I don’t want to spoil his conclusions, so go check out the piece.
Also worth reading is why he didn’t include Flickr in his roundup of potential services to solve this problem.