The name of this service is Everpix and it's basically a photo-organizer. Everpix allows you to save your pictures online and then it organizes all your photos using a special algorithm that hides the duplicates and analyzes the shots dividing the pictures into categories easier to browse. It also has a cool feature named Flashback: it shows you different pictures taken in the past, using the current day and month. It's a nice way to take a look into old (and maybe forgotten) photos and memories. Moreover, all the photos you upload remain private and not visible from the public (unless you want to).
Everpix, on the Mac, has a very useful tool that runs in background uploading every photo you want to sync: simply select the sources and it does everything. The Mac app it's also capable to sync Aperture and iPhoto libraries located into external drives (as my Aperture library) and it works perfectly. Everpix has also apps for iOS and Android, useful to look at your online library wherever you are and allowing you to sync the camera roll. Everpix it's also able to sync with your social accounts, as Instagram, Twitter or Facebook.
The only problem with this kind of service? The slowness of the internet connection. I've a 230GB library and it's taking a long time to upload (0.8 Mbps); it's better if you have a faster connection.
Thanks to @ftrava that introduced me to this service. I absolutely feel to recommend it to you.
Here there's a link, with this you can subscribe and we both have 6 months extra.