I only backup specific folders in my NAS and some of my service DBs. I have test restored some files from Backblaze without issue. With Backblaze you pay for pulls, so I only chose to restore some small files to test restoral. TrueNAS encrypts the data before it goes to Backblaze and then Backblaze also encrypts the data in the buckets on their end, so double encrypted. I don't have another on site copy so not really following the 3,2,1 rule. I figure RAID and an off-site backup is enough for me.