FreeFileSync Forum

I've had to do things similar to this for various reasons. You'll need to use something like robocopy. Test it out on a temp directory first.

https://blogs.technet.microsoft.com/filecab/2008/07/31/robocopy-mir-switch-mirroring-file-permissions/

Basically: ROBOCOPY <source> <target> /MIR /SEC ...

I wanted my FFS tasks to write to the event log as well as send an email if a task was not successful. All the solutions I found were either overly complex, not complete, or required another 3rd party tool. I also wanted to do it all in Powershell. I'm posting my PS script here to hopefully help ...