When making a backup of your virtual machine images, you need to make sure that the data in the VM disk image isn't changing while you are doing the backup. Otherwise you might end up with a useless corrupted backup image.
First of all make sure you have the qemu guest agent qemu-ga installed in...

I have a USB Bluetooth adapter on my PC which works fine, apart from after my PC is woken up from sleep or suspend - and then my Bluetooth is turned off untill I manually turn it back on again. There are plenty of fixes on google which involve setting kernel command line parameters, or module parame...