Zend certified PHP/Magento developer

How to get unison to back up an entire file system starting at /?

I’m using unison 2.52.1 both on my linux machine (Ubuntu version 20.04) and my Mac (MacOS version 11.7).

I want to use unison to back up my entire linux filesystem (excluding a few specific directories via “ignore”) to a directory on the Mac via an ssh connection.

I know how to set up this ssh-based unison transfer except for one key point: it seems that unison is not permitting the initial “root” of the source machine be /. However, since I want to back up everything on the linux machine, I need to start at the root of the linux filesystem tree.

Does anyone know of a way to get unison to allow the source “root” to be / under linux?

Thank you very much in advance.