7Zip Full and Diff Backup Script

7zipBackup.ps1

function Backup {
  param(
    [Parameter(Mandatory = $True)][string]$Inputs,
    [Parameter(Mandatory = $True)][string]$FullBackup,
    [string]$DiffBackup = $null,
    [string]$7ZPath = "C:\Program Files\7-Zip\7z.exe",  
    [string]$UpdateSwitch = "-up0q0r2x2y2z0w2!"
  )
  if ($DiffBackup -eq $null) {
    & $7ZPath a -mhe -ms=off -ssw -mx= -t7z $FullBackup $Inputs 
  }
  else {
    & $7ZPath u -mhe -ms=off -ssw "$FullBackup" "$Inputs" -mx=7 -t7z -u- $UpdateSwitch$DiffBackup
  }
}