This question is maybe a bit basic, but I'm a very long-time Windows user who has switched to Apple only a few days ago. I need to buy some network-attached storage. AirPort Time Capsule of course comes up, but I have the 802.11ac Wi-Fi AP already, and the NAS functionality & expandability of Time Capsule isn't great. How compatible are 3rd party NAS with OSX and IOS devices? For reliability, what is the general recommendation -- to buy Time Capsule from Apple because of its seamless interoperability with OSX and IOS clients? Or to get a good NAS from 3rd party manufacturers like Synology, because AFP file sharing & Time Machine backup to AFP shares "just works"? The initial setup of a more 'techie' NAS is not scary at all for me. I'm only concerned about the long-term compatibility with Apple's kit. Thank you.