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If you are challenged by new technologies or computers, please don't buy this NAS. When the reviewers said this requires much sophistication, I underestimated. However the features it provides for the money you pay, it beats Terramaster hands down. I have not owned Synology and also I'm new to NAS. If you are techie and looking for starter NAS, look no further. Just buy this. Only issue - if you are in Australia, ordering from US, just be ready with a AUS power cable to use for adapter.
Just like any computer, you should try to add the most amount of RAM memory that you can. This one comes with 2gb of RAM, which the factory says it can take up to 8gb. But in some YouTube videos, I watched them put in 16gb of RAM, even from their technician videos.
But that did not work for me, I tried 8gb, 16gb, then just 4gb and it only worked and booted up once. All other attempts failed. I contacted their tech support and they tried to tell me to use a different brand. BRANDS DON'T MATTER AS MUCH as the specs on the RAM sticks. I had exactly what was recommended, and I proved it to them. After about 6 hours of hell, I gave up.
I returned it and ordered the QNAP TS-451+ unit, 4 drives instead of 3. And I watched YouTube videos on that one also, adding 16gb of RAM to this one was a breeze. AND IT WORKS. I've had it now for about 5 days and loving it so far, with many apps to use, I added  4tb drives using RAID 5, so I have a max of 12TB of space. I split it into 3 volumes for Data and Photographs. And then once my data was added, setup Dropbox and ShareFile for a cloud storage. So now I have 3 copies of all the data from 4 computer systems. I also copied data from old drives thru the USB-3 port as an external drive. Worked great. No issues yet.
Having received my QNAP TS-351 I Immediately installed the Crucial 8GB Kit (4GBx2) DDR3 / DDR3L 1600 MT / s (PC3L-12800), bought in Amazon. I also installed three WD 3Gb Red WD30EFRX disks, turned it on and got it all. Then I bought two Kingston Digital SA1000M8 / 240G A1000 240GB PCIe NVMe M.2 2280 drives from Amazon. I installed them and my QNAP251 did not make a boot ... The Amazon technical service helped. First, I had to make a boot only with SSD M.2 drives and only then connect WD drives. Why so I do not know. Now when I upload after updates or when I turn off my QNAP, it doesn’t immediately boot. I have to turn it on and off several times! This becomes a very big problem when I'm not at home. I understand, after my last appeal, that this problem is related to SSD drives. Please help me urgently to solve this problem.
I bought this to replace a 2-drive Netgear Stora RAID 1 system that they will no longer support after April 1. It can be setup with any of several different RAID configurations; I chose RAID 5. The user interface is friendly and there are apps for everything. This QNAP will not only replace my file storage but acts as a surveillance NVR as well so it replaces 2 different appliances that I use.
The product was easy to install and configure. The easy-to-follow user guide was very helpful for hardware installation and the smart install screen made it a snap to configure. Seagate Ironwolf NAS 12 TB drives were used for this chassis.