Can you explain the situation around you restoring a backup? Did backblaze lose your data?
AFAIK AWS replicates your data across buckets for reliability in case their datacentre goes down, which (from what I understand) is the cost of a whole another bucket with B2. That's my concern. I don't think Backblaze is going out of business any time soon but I'm afraid of data loss (I do have one local backup but my budget is unfortunately a bit tight right now - I'm going to have to pick and choose important bits from all of the data and add a second backup I guess)
I'm worried about reliability; what are the chances that they will lose my data? I have a local backup but I'm also feeling paranoid