Powershell backup

 #Backup folder
$dateStr = (Get-Date -Format "yyy-MM-dd-HH-mm")
$Source = "C:\source"
$Staging = "U:\BKPTemp"
$Destination = "U:\Backup\destination_$dateStr.zip"
Get-ChildItem "U:\Backup\" -Recurse -File | Where CreationTime -lt  (Get-Date).AddDays(-90)  | Remove-Item -Force
Add-Type -AssemblyName System.IO.Compression.Filesystem
Copy-Item -Path $Source -Destination $Staging -Recurse
[System.IO.Compression.ZipFile]::CreateFromDirectory($Staging, $Destination)
Remove-Item -Path $Staging -Force -Recurse
exit