How do I back up Qubes 4.2?

Up to 4.2 I have simply attached an external usb disk to dom 0 and run the backup or restore gui tools. But that I gather now is very insecure, and dom 0 doesn’t allow that any more. There seemed to be a special qube in 4.2 to which I could attach the external usb disk, but I don’t see how to connect the rest of the qubes to it in order to run the backup tool. I know I’m missing something, because the backup and restore gui tools are still there.

attach the usb disk in a qube (it can be a disposable) and use it when you set the backup destination

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thank you! I’d always thought I had to attach to dom 0 in order to get access to the other cubes. (And like the phlogiston theory in Chemistry, it did work for me for 5 or 6 years.)

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