With data storage needs increasing, using a NAS with a RAID setup provides an added layer of security. What RAID level should one use for the best balance between data protection and storage capacity?, and what are some best practices for maintaining and securing a RAID-enabled NAS?

i am sure you guys sit on heaps of experience on this topic so please share your thoughts and tips with me.

right no i have only two hdds from two diffrent companies one 4 tb and one 12 tb. my raid 0 ssd main drive went tits upp and im now banished to a old laptop until payday.
im looking for longterm reliable storage, and this warning from the thec gods have poised me to make my very own noahs ark.

i dont want to loose it all to something traivial as did not have backup.