You need to investigate owncloud, it is a self hosted cloud drive, think Dropbox, the pi is the machine in my house which is already internet facing, and has a wordpress blog running, with a domain name attached, so it made sense to use that. The owncloud android app sends all my photos and videos to the pi, and then when I am at my pc, the owncloud windows app pulls the files from the pi,so all files are synced. Once set up correctly, all of this happens without any manual intervention, and files are stored in 3 physical discs, my phone, my pi ext hard drive,and my PC. I also have an off site backup on oracle S3 Archive.