dbus won't back up

[Myke Fynke]

I run Ubuntu 18.? (the bionic beaver gizmo). My problem is that dbus 
gives my backup program fits because dbus refuses to be backed up. It 
will not allow the backup routine to back up the contents of the dbus 
file. Access to the file is refused.

So tell me in plain english: what does dbus actually do? Why are its 
contents protected? What happens if I delete dbus? My backup routine 
hates it. I cherish peace among my apps. . . .

Thanks for any advice.

Best to you, whoever you are.

Myke Fynke