I think NAS is great for techies but optica disc storage is better option for family memories and stuff.
A NAS need maintenance and can get expensive.
LTO tape take a lot of care, I just read about it again.
It needs proper storage and maintenace and even then it last for 30 years.
Optical media last 50+ years and storage conditions is just normal home climate. I think for childhood memories, important documents, wedding videos is a perfect medium.