I wish I had heard your episode that mentioned that Blackblaze had an option when you hit the 30-day limit, or at least I wish that the tech support person I emailed knew that they had that option.
I backup, or at least I used to backup my Drobo with Backblaze as well as my computer. As someone who has been known to travel for 4 weeks at a time, I have almost hit the 30 day limit before. But I ran into a problem in spade in September when not only did I travel for 3 weeks out of 4 but also my Drobo stopped working reliably rather suddenly. Not the time to lose your backup but that is exactly what happened to me.
If I had been smart I probably should have paid for a copy of the data on a drive to be shipped to me but did not think of that in time. I was able to backup most? some? all? of the data from the Drobo to a large portable disk using Carbon Copy Cloner and my wife’s laptop. The Drobo would periodically just fall off of USB but I setup Carbon Copy Cloner to back it up whenever it remounted.
So now I am back in the tedious process of backing up that drive to Backblaz but that will literally take months.