Risks of allowing drives to mount in sys-usb in 4.3

[alannis]

@unman this is one more post discussing this issue:

Error during 4.3 upgrade

This is a known annoying issue. By default, on r4.3, sys-usb has a minimal-usbvm service enabled. Which prevents it from opening the external USB drive in backup or restore dialog. I personally disagree with that design. But it is my personal opinion. you have many options to restore your backup: Attach the external drive containing your backups to a regular AppVM and then restore from it. You could disable the minimal-usbvm service of sys-usb, restart it and then you will be able to restore …

By default, you will will an error message if you try to mount a USB drive. I solved it by unchecking minimal-usb VM under services in sys-usb settings, in a Fedora-based sys-usb.