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Updated
This brand has a long-standing of reliability and trustworthiness in this category. They have excellent long-term support. Feature updates (e.g. the newest DSM WebOS) are often even pushed out for 10-year-old hardware - you'll find it hard to find that level of support elsewhere. This NAS has 2-bays, storage up to 2x108 TB (theoretically speaking), companion apps, and its UI runs in a WebOS-System within the browser (and is therefore not bound to any operating system).
SpecsUpdate
Pros
Pro Single-button press backup functionality (ports and button on the front)
This function is called USBCopy. You just need to attach your media to the front, press the Copy button (labeled C on this version) and wait untill it's done (no need to have it attached to any PC and no need to login to the NAS as well). By default, the backups get compressed to a single archive per backup and are named after their device name and timestamp attached (changeable within the settings). Older/other versions also had an SD-Card reader, this one doesn't (but it seems to have an eSATA port) so you might search for an alternative if you need the SD-Card reader.
Pro DiskStation Manager OS is rock solid
DiskStation Manager OS is by far the best commercial NAS-OS out there when it comes to expandability, usability, and stability. No other system comes close, unless you build one yourself and use an Open-Source NAS-OS that you fine-tune to your needs.
Pro Company-level advanced BTRFS file system with built-in data integrity check
See further details on Synology's page
Cons
Con Not made for 4K streaming addicts (PLEX)
Yet so are typical other NAS from other manufacturers unless they are tailored for the purpose. Synology calls these NAS boxes "play" e. g. DS216play. They often have other drawbacks.
You have to spend more to get hardware level support for proper media-streaming. This is, however, not the usual task for a NAS and is only interesting if you need to stream 4K files (most often other bottlenecks are in-place like a slow network connection anyway). For streaming 1080p this NAS should be fine.
If you need serious streaming look elsewhere.
Con Too many variants, pricing is not always logical
With, without an SD-Card reader; with, without a copy button and front ports. Model numbers also don't seem to follow any logic so you have to be careful when buying here. Also with some, you can switch the RAM model yourself while on many others it's soldered to the mainboard. You don't need the latest model. Be careful selecting one to fit your needs and pocket when buying (they're pretty good even when they're used - just use new HDDs and you're fine).
Con Requires a bit of work if you want to get the most out of it
It's clearly not made for people that want to buy a device and just use it but those that take some time to set it up. Once you're done, it runs, and runs, and runs (till you want to do more, which you can since it has Package-Management built in that enables you to download new packages and extend the functionality of your simple NAS).
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