CrashPlan+ for less then $5 a month unlimited backup. Also it runs on my Linux server and I can have all my computers and family computers backup to the linux machine for free then the Linux box is backed up.
One problem with Crashplan is that it seems to be all-or-nothing.
I've got it running on my desktop at home; I've got gigs and gigs of photos there. My macbook doesn't have enough free disk space to store all of them - and Crashplan doesn't let me store and sync just the 2014 photos.
Does it do selective sync? e.g., HOME:/media/pictures contains folders for 2014...etc, and LAPTOP:/media/pictures/ only contains 2014, and any changes to LAPTOP:/media/pictures/2014/ get propagated to HOME:/media/pictures/2014 etc?
Nope, their mobile app is used as a file manager for your backups.
Crashplan has a desktop app that backs up your photos indefinitely though. It backups your external devices as well, been using them for years and I can't tell you how many times it's saved me.