RNDU4000, use as external HDD?

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Ahrle wrote:

So it is possible to install VeraCrypt on the NAS? Is there an app or something? Tried several apps from https://apps.readynas.com/pages/?page_id=9, however all threw error messages and failed to install. 

Veracrypt itself is installed on the PC and the server,  The veracrypt container is on the NAS.  Since the encryption is client-side, stealing the NAS wouldn't compromise the data.

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Ahrle wrote:
1. The PC. All information that should be backed up is offloaded to a RAID on the PC.
2. PC -> NAS. The NAS clones above mentioned RAID off the PC.
3. NAS -> Server. The NAS is physically brought to the basement for the server to clone (reverse version of the PC)
4. Server -> SAN. The SAN unit will then clone the server's backup. 
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I really don't mind the Ultra4 taking its time. The basement is a hobby room full of retro junk to play around with. Besides, this is just a personal life backup, which isn't about to grow exponentially. It's currently 800GB, of which at least 300GB are uncut videos to be thrown away. We talk, perhaps, an increase of ~25MB a week on median, which can't really take that long to synchronize?

Incremental backup should only take a few minutes, so the approach should work.  You will need to be careful when transporting the NAS - at least checking that all the drives are fully seated before powering it up in the new location. There are some posts here from folks who've run into problems after tranporting their NAS.

Something along these lines would also do the job I think: https://www.bhphotovideo.com/c/product/1113481-REG/apricorn_a25_3pl256_2000_aegis_padlock_usb.html  So if you are purchasing new drives for the NAS, you might consider that alrenative.