I have both QNAP (TS212) and Time Capsule. I used QNAP for TM backups, but had a lot of frustrations with it. Never tried a restore from QNAP, but got a lot of failed backups warnings. TC has been flawless, using it for several Macs and Hackintoshes, and no issues with backups or restores (several successful restores). But, in my experience, USB3 drives result in much faster restores (and backups) than networked drives.
I would balk at jumping into third party NAS for Time Machine at this point. With Apple about to rollout the new APFS for Macs (I am assuming it will become the default in the next macOS release), compatibility is not certain with third party network storage systems, it may only work with Apple gear, or attached USB\Thunderbolt drives. They claim it will eventually become open source, but the timing may lag.
I wouldn't be so quick to assume Apple is bailing on the network gear. They simply said the teams were re-assigned to other products, which could mean a new product that does networking + ?. Maybe the speculated Siri device will be a network device with speakers, drives ala TC, and central iTunes storage\Apple Music... Rumors seem to be that they will unveil this in the WWDC keynote next month, so maybe wait and see what they have up their sleeve?
You might want to take a closer look at your router. I admit I have an Apple AirPort Extreme. I've done Time Machine backups wirelessly on both a WDMYCLOUD and Synology DSM with at least 4 different Macs and only had an issue 1 time where it got corrupted. I just rebacked it up and it has been fine ever since.
Edit: Because doesn't everybody own 14 different Macs?![]()
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I've been using a Synology NAS for years now. I had no knowledge or experience with NAS prior to purchase. I've been extremely pleased with my purchase, and would recommend it. I'm sure there are other quality NAS out there.
Of the two mentioned, my suggestion would be the Synology.
If you haven't done so already, got to their web site https://www.synology.com/en-us and take a look at the 'Live Demo'.
I'd recommend against using Time Machine on a NAS – otherwise you're just inviting frustration. Attached external drives – Thunderbolt or USB – are still the best for use with Time Machine.
Time Machine backups over a network tend to get corrupted easily, which when it happens requires you to discard all backups made and start all over again. This usually happens every two weeks or so – depending on how noisy your wireless network environment is operating in or how frequent you disconnect while a backup is running.