Hi, Jim from Backblaze here.
About 2 years ago now, we started including the 1-Year Extended Version History for all accounts.
We did not automatically turn it on for everyone, as it is not something everyone wants.
But there is no longer an extra charge for the 1-Year Extended Version History option when enabled.
You can also enable the Forever Extended Version History option, which will keep any deleted/changed/updated file for a year as part of the base plan, and then after that year that file will begin accruing a storage cost at our current B2 per GB storage cost.
So if you have 1TB of files in the Forever Extended Version History plan, it would cost you an extra $6 per month on top of your current plan.
The storage charge is only charged on files that have not been seen on the customer's computer in over 365 days.
I hope this helps, but please don't hesitate to email us still if you have questions. We are here to help.