BackupFile.ps1

Param(
     [string]$Path = './app',
     [string]$DestinationPath = './',
     [switch]$PathIsWebApp
   )

   If(-Not (Test-Path $Path)) 
   {
      Throw "The source directory $Path does not exist, please specify an existing directory"
   }

   If ($PathIsWebApp -eq $True) {
        Try 
        {
          $ContainsApplicationFiles = "$((Get-ChildItem $Path).Extension | Sort-Object -Unique)" -match  '\.js|\.html|\.css'
     
          If ( -Not $ContainsApplicationFiles) {
            Throw "Not a web app"
          } Else {
            Write-Host "Source files look good, continuing"
          }
        } Catch {
         Throw "No backup created due to: $($_.Exception.Message)"
        }
     }



$date = Get-Date -format "yyyy-MM-dd"

$DestinationFile = "$($DestinationPath + 'backup-' + $date + '.zip')"
If (-Not (Test-Path $DestinationFile)) 
{
  Compress-Archive -Path $Path -CompressionLevel 'Fastest' -DestinationPath "$($DestinationPath + 'backup-' + $date)"
  Write-Host "Created backup at $($DestinationPath + 'backup-' + $date + '.zip')"
} Else {
  Write-Error "Today's backup already exists"
}