I can explain!
I have, right next to me here, a fat server running FreeNAS. Which is nice, but it doesn't really do much other than handle my backups. There's no UI, so I can't have my assistant or wife or half my staff do anything at all. Still.... if you're cool with command line, that's great.
Synology has built in tools which are AWESOME. Right now, for example, I've been writing some code for a new system. Every time I hit Save, a copy of the file is being synced to my local Synology 213+. I can open the directory, right click on any file, and choose to recover any version (I set it to 20 versions back).
Synology has a built in sync tool, so you can sync it to another Synology Nas, backup tools, which is why I have my older one at home, plugged in the basement, but at 3am is getting a nice fat copy of the files from the office.... took me all of 5 minutes to set that up.
There's another option where you can upload stuff to Amazon S3. So, some stuff goes right to S3 every night and costs almost nothing. AND.... there's a Amazon Glacier plugin, where you can have stuff that you'll probably never need again, but need access to, and costs almost nothing, and you want to make 100% certain nobody messes with it: Like all my taxes and legal stuff.
Then there's media features. Honestly, this is totally dishonest and horrible of me, but when my kids want to watch some *****ic movie, I can pull out my phone, open up ds download, and find a torrent of the movie in about a minute. Click "download", and put my phone away. By the time I get home from the office, that movie will be there.
Since PLEX is a built in plugin (as is their own ds video app), my ROKU sees it just like netflix.
Anyway, I could go on for a day about how great these things are. FreeNAS.... it's a nice big hard drive. The diskstations are Servers. They're tools that make life a lot easier, especially if you're trying to spend your time running a business.
Oh.... there's also PhotoStation, which I've got installed on the home one. You can have your phone's picks auto-upload to it. Then, if you want to share stuff on facebook or something, you send it via the diskstation, and it looks like a normal pic, but it's coming off your diskstation and the right-click download is disabled. Obviously, you can still get the image, but its like putting a lock on your front door.... they can still break in if they really want to, but it makes it harder. AND, if you later have a bunch of crap you've posted and decide you wish you didn't post... there's a box where you can just see all the stuff you've shared and un-share it. (wife loves it).
Sorry for going on.