CB Backup Server Edition - The commercial edition has a limit Let me offer an alternative for you. You have 8 licenses now. You would find using our Managed Backup product much easier to manage and upgrade, and it comes without any storage limitations.
Subscriptions are available both monthly and annually (with an additional 20% discount) off the normal discounted price. You said you are backing up servers, but if you are using the product, or need to use the managed product, on desktops and you use our Integrated AWS Storage instead of B2 and Azure, you can get desktop licenses for $1/month ($2 for non-MSPs).
In order to make the transition easier for you, we would provide you some credits based on your original CloudBerry Server Backup licenses so you do not feel like you're losing your original purchase spend.
If you would like to speak to Sales for more information about Managed Backup and get a quote based on your needs, please use this link:
https://www.msp360.com/contact.aspx/?category=sales
I also do weekly webinars on Managed Backup. There is one scheduled tomorrow at 12 PM ET. You can register to learn more about the product and see the advantages over the manually managed product you're using today:
https://get.msp360.com/webinar/getting-started-with-msp360-managed-backup
Let me know if you have any questions.