A problem.
If your backup disk is connected to the machine and you pick up a bug both the disk your running off and your backup disk might be toast.

If you then connect your 2nd backup disk to restore from and the bug is still active it could be toast.

My backup disks are never connected with windows active.

This is what I use.....https://www.backup-utility.com/download-iso.html
With a couple of spare disk which I rotate every 15 days.