If I want to achieve the following requirements, which device is the best for myself?
1. To backup (incremental) my MacBook folders (document, files, photos, videos, etc) to NAS
2. To backup (incremental) my iPhone (all full backup) to NAS
3. Can 1 & 2 be done automatically when the devices are connected to home wifi.
4. To backup the NAS (copy) to external USB drive.
The cheapest NAS for snapshots is DS218+ , but DS118 will do similar task with a drive app. You can set it up to work like a Dropbox, but you don’t need to pay monthly subscription. All your office documents will be backed up incrementally and you will be able to roll back to a previous version of the file (ds218+ will do previous version of entire folder not just a file). All backups will be done in the background when you are in the WiFi (phone and PC). Also to do a backup – you can connect external drive and set it up do do scheduled backups or once you connect the drive.
What can I connect to a NAS?
Wireless Speaker Sonos
The 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!").
Nowadays 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 TV
You 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 TV
It 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.