Replace the Drobo 5C to NAS 6 bay

[Enquiries]

I never used NAS before, just DAS. Now that Drobo is finished, I want to use found a new backup way with NAS. For this NAS, I also want to replace the Google Drive for my iPad to connect, download or access my business catalogues.

My network will upgrade to 2.5Gbe Wan and 10Gbe intranet. And I already have 6 3TB HDD.

Now I'm looking at two NAS one is DS1621+ and TS-832PX.
Both prices are under USD860 in Hong Kong.

Question
1: Qnap is more potent than Synology but easy to hack. If I sync with my cloud, will it be easy to hack?
2: If DS1621+ need 10Gbe need to add nearly USD150 for the LAN card?
3: For the second-hand market, Synology is more valuable.

May I have some advice on which one is fitter my case?

[ed]

New Qnap software protects users more than before. Most of the hacks happened because people opened ports and had a weak setup.
The synology default setup is more secure though. But all this can be configured.
Second-hand market is also a good option if you are happy to have no warranty.