I keep backing up photo over the years and I want to try and organize them. A few questions: 1 - If I keep a non-bootable hard drive for media, can I keep my Photos library on there? 2 - If a photo is brought into my Photos library, does it get moved into it? Is it then saved twice on my computer? 3- On the meta level, what's the best way to try and organize everything? Move it all into the Photos library?Another app or service?