This is a really excellent idea, and a great way to expand your existing services, while adding some additional revenue to your business.
Most backup services offer many of the same features, when it comes to encryption and security.
And they all generally function in the same manner.
Where white label backup services really start to differentiate is with branding, licensing, pricing structure, storage costs, and most importantly support.
These are areas that will impact you the most in determining whether this is going to be sustainable and profitable.
WholesaleBackup provides 2 white label backup solutions and allows you to fully brand the backup client no extra fees, no co-branding. It is a USA based company and the support team is responsive and lives in the US.
You can get started on a free trial, it only takes a few minutes to setup. wholesalebackup.com
Good luck!
Ryan