Suitable 4 bay nas for my use patterns?

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I would suggest Synology NAS. It is very easy to set up and use. They also have the best Windows backup option and also come with a Dropbox-like alternative called Synology Drive.You can also use the Moments app to backup your phone multimedia and also install Surveillance and get notifications on your phone.I would look at multi LAN options such as 20+ series NAS. They have 2 / 4 / 5 bays models available.Their DS Video app will allow you to stream all videos across the internet. They also come with a transcoding function that will convert video into a smaller size so that broadband speed can cope with it.You can also access your multimedia and other files locally via DLNA protocol or another way of connecting.I hope this helps.