Best way to store and backup large iPhoto library?
Hello. I'm trying to find the best way to store and backup my iPhoto library. I'm using a Macbook Pro with Retina Display, OS X Yosemite 10.10.2 with 512 GB of storage. I currently have about 70,000 photos, totaling over 240 GB. Since about half of my storage is photos, I would like to reduce this to optimize the speed of my Macbook. I frequently access many of these photos, so it would not be practical for me to store most of the photos elsewhere and only keep the most recent photos on my computer. Instead, I'm thinking of storing these photos on a portable 1 TB external hard drive (plugging it in when I need to access my photos), but I would still like to back all of them up with the rest of my Macbook on a 2 TB hard drive. Is this possible? If not, any alternate suggestions would be greatly appreciated.
MacBook Pro with Retina display, OS X Yosemite (10.10.2)