Multiuse Home NAS?

Hello,
I decided to get my first NAS for improving my back-up strategy, save old DVD Data before it is to late and use it as media server.
I want to use it to stream videos in my network on my Smart TV and it should also be possible occasionally to stream with a mobile device via the Internet, so transcoding is not completely unimportant. The videos currently does not exceed the 1080p quality, but it would be great for the future if streaming of 4k files in the network is possible. I don't expect live transcoding of 4k video data.
The housing should have 4 to 6 bays for 3,5" HDDs. It's not fixed that it has to be a Sonoly NAS, but I really like the possiblities of the DSM.

Best Regards and thanks

It can be very confusing to choose the right NAS when there are so many options out there. But there are a few things that can simplify the decision. First of all, you need to check if NAS come with a graphics chip built-in. The transcoding engine will deal with video and audio conversion while the processor can deal with other things like serving files and applications. Without this chip, all heavy work will be done on a CPU and NAS performance will noticeably be effected.The other thing is artificial intelligence and how your media will be organised and filtered. Are there photo GEO location filter, face and object recognition? This is something you can get used to with Facebook photo galleries.And finally the app quality. Are there good mobile app too not just desktop and apps on the NAS itself.DS920+ and DS1520+ would be the most future proof options. If you use Synology apps you can do live transcoding of 1080p and even 4K.Synology is regularly updating its software and adding new features. Also, support is comparably superior to others.I hope this helps.