Copy new and updated files

how can I do in powershell the following

I had

 SourceFoler  = d:\temp\SourceFolder

TargetFoler = d:\temp\TargetFolder

OtherFolder = d:\DiffernceFolder

I want to copy new and updated files from source folder to target folder

AND

Capture ONLY these updated and new files and copy them to "Other folder"

How I can do that ?

Thanks in advance