But thinking into the future, i trust more in Veeam to deliver a 99,9% solution than admins of different skill-levels across the world implementing selfbrew-security!
Maybe put your own idea of "enable customers to secure their backups on-prem" on the feature request list - I trust in you that you already did that
Meanwhile, trusty old tapes - right now i've got to retreive the tapes from our other facility to put them into the safe...