storage backup with encryption on-the-fly ?

[lejeczek <peljasz@xxxxxxxxxxx>]

    Hi guys.
        
        Is there a solution, perhaps a function of libvirt, to backup
        guest's storage and encrypt the resulting image file?
        On-the-fly ideally.
        If not ready/built-in solution then perhaps a best technique you
        recommend/use?
        I currently use 'backup-begin' on qcow2s, which are LUKS
        encrypted.
        
        many thanks, L.