Allow Web Hosting Providers To Resell Backup Storage Accounts Using JetBackup/WHMCS
I notice you have https://www.jetbackup.com/jetbackup-whmcs-module/ but that only allows hosting provider to backup customer's website which means the customer also keeps their backups with the same provider. It would be better if a hosting customer could back up their cPanel accounts to any provider using JetBackup/WHMCS. The customer could simply go to a different provider and signup for a backup storage account and they enter their login details to any cPanel or cPanel accounts (if they are a Reseller) and then it will back up all their data from one provider to a different provider for extra peace of mind.
Using JetBackup API/cPanel/WHM/WHMCS, a provider can then offer a service like this https://www.websitebackupbot.com ?