> Every last weekend of the month, I will manually backup all the data to Blu-ray discs. Not once, but twice. One copy goes to a safe storage space at home and the other one ends up at a completely different location.
This is one paragraph after mentioning a 2TB+2TB NAS. Even assuming that's RAID1, a standard Blu-ray only stores 50 GB, so you need 40 of those. And then you need another 40 for the other location... every month?? Honestly it's probably cheaper to buy a new 4 TB hard drive every month.
If you're a cheapskate like me, backing up your encrypted (e.g. Borg) backups to a cloud provider like Google Drive isn't a bad option. My org provides me with unlimited cloud space, so I have hundreds of encrypted gigs on Google Drive. No reason to think it'll disappear overnight.