However, for that to work the targeted Computer must have a disabled/malfunctional Firewall. There are many Computers with that kind of Firewalls, especially if a stupid User decides to "Hey this is annoying me with its permanent blocking of the Interwebz for Programs I just installed, just disable it".
My own Firewall doesn't allow ANY inbound connections at all for example (not even Dropbox or Chrome are allowed), so it cannot work for me.
Inbound Connection meaning something trying to create new Connections to the Computer from the outside.
I think that is overprotective. Blocking inbound is a security measure you o not need for your home computer. Not even for your work computer. I suggest making backups instead, with 1 ay intevall on an external drive, overnight, and keeping these for a few weeks. Tat should be more than enough.