Comment Synology NAS (Score 4, Informative) 146
This may be overkill for your needs, but I have a Synology NAS that does this. It's got a Dropbox-like app called Cloud Sync to sync all your devices with your NAS (and will sync WiFi-only for your Android if you want). It also has a separate photo app that will auto-upload your photos to your NAS. It includes many other apps that might interest you as well.