Reading HDD on Linux PC after NAS failure

[peppinello]

Hello,

I am thinking of buying 2-bay NAS disk and use Raid 1 (mirroring) to prevent disk failure. I wonder about failure of NAS itself. I read, that in case of 1-bay NAS I can read data just by plugging disk to PC with Linux distro installed and it mounts it and read without any problems. Raid 1 is just mirroring, not like Raid 0,5,6, so i think both disk should be readable like from 1-bay NAS. So i have 2 questions:

Is my assumption right?

Is it true in general or it doesn't work for some NASes?

I didn't choose NAS yet, but it will be one of these:
Synology DiskStation DS211(+)
QNAP TS-219P+ Turbo NAS

 

[thiggins]

Mirrored drives, if they are not damaged by the NAS failure, can be read as long as the computer they are connected to can mount them. This usually means a Linux or other open source OS.

Never count on RAID as backup. Always back up critical data on another device.

 

[peppinello]

I will back up critical data to my external hard drive. I do it also now, but I don't do it so often and that data is not always up to date.
But reason I am asking it is, that I plan to rip my DVDs to that NAS (it is legal in my country to do so for personal use if you own original DVD) and i won't have any backup of it anywhere else. I don't consider it critical data and I will still have DVDs, but it would cost me a lot of energy to rip it again in case of failure, so I want to have it as safe as possible.