Extenua's SOS service will be absolutely FREE OF CHARGE till August 31st, 2020. Until then the enrollment process will not even ask you for any payment information, so it's totally safe to sign-up.
This is a simple cost estimator for Extenua's Secure Object Storage (SOS) service. It can help you estimate the cost of the service based upon your projected usage; all you have to do is provide the estimated number of GET and non-GET requests, and the approximate number of objects you will be storing. The result you see here is an estimate based on the most common usage assumptions.