Powershell script to copy sharepoint files to a local directory using Powershell Core and PnP.PowerShell

powershell_copy_sharepoint_to_localdir.ps1

# Input Parameters  

# Install-Module -Name PnP.PowerShell -AllowClobber

$folder = "/Shared Documents"  
# $backupDir = "C:/Users/USER/projects/powershell/backup"
  
function New-BackupDir {

  $date = Get-Date
  $dateString = $date.tostring("yyyy-MM-dd-HH") 
  $newBackupDir = $PSScriptRoot + "\backups-" + $dateString
  $newBackupZip = $PSScriptRoot + "\archive-" + $dateString + ".zip"
    

  if ( -Not ( Test-Path $newBackupDir ) ) {
        
    Write-Host "creating a directory ... ["$PSScriptRoot "] "$newBackupDir " " $newBackupZip
    $nDir = New-Item -ItemType Directory -Path $newBackupDir -Force
            
    if ( $nDir.Exists ) {
      Write-Host "created ok..."
    }
    else {
      Write-Host "Error creating directory " $Error
    }
            
    # Compress-Archive -Path $PSScriptRoot -DestinationPath $newBackupZip

    # encrypt / decrypt with
    # https://4sysops.com/archives/encrypt-and-decrypt-files-with-powershell-and-pgp/
    # Add-Encryption -FolderPath C:\Users\USER\projects\powershell\important\ -Password VERYSECRET 
    # Remove-Encryption -FolderPath C:\Users\USER\projects\powershell\important\ -Password VERYSECRET -Verbose
    # create a windows link with 
    # powershell.exe -command "& 'C:\Users\USER\projects\powershell\make_dir_datestr.ps1' -MyArguments blah"
    # script creation of the link with 
    # $WshShell = New-Object -comObject WScript.Shell
    # $Shortcut = $WshShell.CreateShortcut("C:\Users\USER\projects\powershell\RunBackupScript.lnk")
    # $Shortcut.TargetPath = "powershell.exe"
    # $Shortcut.Arguments = "-command `"& 'C:\Users\USER\projects\powershell\make_dir_datestr.ps1' -MyArguments blah`""  
    # $Shortcut.Save()

  }

  return $newBackupDir

}

# Loop through to get all the folders and subfolders  
Function GetFolders($folderUrl) {      
  $folderColl = Get-PnPFolderItem -FolderSiteRelativeUrl $folderUrl -ItemType Folder   
  # Loop through the folders  
  foreach ($folder in $folderColl) {                      
    $newFolderURL = $folderUrl + "/" + $folder.Name   
    write-host "[" $newFolderURL  "]"
    $newBackupDir = $backupDir + $newFolderURL
    $nDir = New-Item -ItemType Directory -Path $newBackupDir -Force
    Write-Host "=> {" $newBackupDir "} " $nDir.CreationTime

    $fNames = Get-PnPFolderItem -FolderSiteRelativeUrl $newFolderURL -ItemType File
    foreach ($fName in $fNames) {
      
      $fromFile = $newFolderURL + "/" + $fName.Name
      $nfile = $newBackupDir + "/" + $fName.Name
      Write-Host "         < " $fromFile
      Write-Host "         > " $nfile
      Get-PnPFile $fromFile -Path $newBackupDir -FileName $fName.Name -AsFile -Force
    }


    # Call the function to get the folders inside folder  
    GetFolders($newFolderURL)  
  }           
}  
  
# Connect to SharePoint Online site  
Connect-PnPOnline -Url "https://SITENAME.sharepoint.com/sites/SITEURL" -Interactive -ForceAuthentication
  
# Call the functions  

$backupDir = New-BackupDir

Write-Host "backup directory is now [$backupDir]"

GetFolders($folder)