Powershell for syncing Minecraft save files
Looks fine for me. As a note - instead of using Write-Output for display purposes use Write-Host cmdlet. 

In a nutshell, Write-Host writes to the console itself. Think of it as a MsgBox in VBScript. Write-Output, on the other hand, writes to the pipeline, so the next command can accept it as its input. You are not required to use Write-Output in order to write objects, as Write-Output is implicitly called for you.