I saw the technology news yesterday, and knew Google Photos is unlimited space for free. It can also create the animation and album automatically. I would like to recommend you to use Google Photos if you have a lot of photos.
It can also backup your photos from your computer and your device, and it won't destroy your photo resolution. Remember, you have to choose the unlimited space, not google+ space when you are first using app or installing the program then you can enjoy it. You don't need to worry about your space and resolution because space is unlimited and resolution is fine.
I think Gmail will get the unlimited space if Google Photos is successful.
Google Photos: https://photos.google.com