If you are using Spinbackup as a customer and have agreed to our terms of service, you do not need to sign an additional Data Protection Addendum. As of May 25th 2018, our user terms of service include a provision to ensure compliance with GDPR.
If you are a Partner or a customer who needs need to further documentation of compliance with Spinbackup acting as a Processor (for example, as a customer who processes their own user's data through Spinbackup or as a Partner who resells directly with Spinbackup) you can sign our DPA as follows.
Click here to see our DPA.
If you have any questions or comments on our DPA you may email at firstname.lastname@example.org for further information.