I would like to use a NAS for DLNA streaming to my TV for movies, data storage using Backblaze B2 and surveillance for my two security IP cameras. I was going to get a 4 bay nas with 2x 3TB surveillance drives for the cameras and 2x 6GB drives for data.
I would suggest DS418play from Synology. They partner with Backblaze for disaster-proof backup solutions. You can fill it with 2 WD Purple drives for Surveillance and two WD Red for data storage. Or you can will it all with Red drives to get maximum storage space with a RAID5. Red drives will work well with a surveillance as well as data storage tasks. If you need some more expandability, you can have a look at DS918+.
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What can I connect to a NAS?
Wireless Speaker SonosThe great thing about Sonos is that you don't need to pay for music subscription service. With the cheapest NAS at home like DS115j or any other, you can have your backups done for all of your devices and still use your network drive as a Sonos music library. Sonos will connect to your NAS via your network and let access your provided music library. If you have little more of IT knowledge, you can even set up your Alexa or Sonos with Alexa built in to play music on your voice commands ("Alexa! Ask DS Audio to Play Music!").
Casting devicesNowadays it is so cheap to upgrade your old TV and make it smart. All you need is Google Chrome or EZcast alternative plugged into your HDMI port at the back of your TV. Now you have great functionality added to your TV to send a video file directly from your NAS to a TV. No need for wires and chargers and other mess. You can use your phone as a remote to go to your movies or family videos and cast that content on your TV during family or friend gatherings.
Amazon Fire TVYou may not have a smartphone, or you just simply prefer to control your content with a remote in that case Amazon Fire TV will be a great addon to get to your TV. It also plugs into your HDMI port and will play content from your NAS to a TV. No wires no mess.
nVidia Shield TVIt gets even better! If you want some more entertainment and all previously mentioned functions - nVidia TV is a great thing to get. You can use it for playing games and watching movies from your NAS. The greatest thing is - shield TV does video transcoding. So even if you have a cheap NAS with a weak CPU, in a combination of shield TV you can now automatically on the fly change video file size and format for a destination device. It is a great way to reduce network load and let older devices to play video content which normally was not supported on the device.