$source='\server1folder\*'
$destination='\PC1c$tempfolder'
copy-item -path $source -destination $destination -recurse -force

copy-item : container cannot be copied onto existing leaf item.
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     + categoryinfo    : Invalidargument: (\server1folder:string) [copy-item] PSargumentexception
    +FullyQualifiedErrrId : CopyContainerItemToLeafError,Microsoft.powershell.Commands.CopyItemCommand