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I'm looking into google photos to back up my phone photos...
I use Flickr (1Tb) for that. Here's a writeup on that:
http://iphonephotographyschool.com/flickr-app/One tool for backing up photos that seems quite ambitious is PicBackMan:
http://www.picbackman.com/for Android/iPhone/Windows/Mac - works with Google Photos/Picasa, Flickr, OneDrive, DropBox, Instagram, Photobucket, etc.
I haven't used it myself, though.