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Copy library folders and contents to another library

Author: Nico De Cleyre

The following script shows how you can copy all library folders and contents to another library.

param
(
    [Parameter(Mandatory = $true, HelpMessage = "The source site url")][string] $SiteURL,
    [Parameter(Mandatory = $true, HelpMessage = "The server- or site-relative URL of the source document library")][string] $SourceFolder,
    [Parameter(Mandatory = $true, HelpMessage = "The server- or site-relative URL of the destination document library")][string] $DestinationFolder,
    [Parameter(Mandatory = $false, HelpMessage = "The destination site url")][string] $DestinationUrl
)
try {
    #Connect to m365
    $M365Status = m365 status
    if($M365Status -match "Logged Out"){
        Write-Host "Logging in the User!"
        m365 login --authType browser
    }

    # Set the destination URL the same as the source URL if it's not given
    if($DestinationUrl -eq ''){
        $DestinationUrl = $SiteURL
    }

    $SourceFolders = m365 spo folder list --webUrl $SiteURL --parentFolderUrl $SourceFolder | ConvertFrom-Json
    foreach($Folder in $SourceFolders){
        if($Folder.Name -eq "Forms"){
            continue
        }
        $DestinationFolderUrl = $Folder.ServerRelativeUrl.Replace($SourceFolder, $DestinationFolder)

        # Create level 1 folders first
        Write-Host "Creating '$($Folder.Name)' in '$DestinationFolder'" -ForegroundColor Yellow
        m365 spo folder add --webUrl $DestinationUrl --parentFolderUrl $DestinationFolder --name $Folder.Name | Out-null

        # Copy everything (folders and files) to this target level 1 folder
        Write-Host "Copying '$($Folder.ServerRelativeUrl)' to '$DestinationFolderUrl'" -ForegroundColor Cyan
        m365 spo folder copy --webUrl $SiteURL --sourceUrl $Folder.ServerRelativeUrl --targetUrl $DestinationFolderUrl --allowSchemaMismatch
    }

    # Copy files from root
    $SourceFiles = m365 spo file list --webUrl $SiteUrl --folderUrl $SourceFolder --fields "ServerRelativeUrl" | ConvertFrom-Json
    foreach($File in $SourceFiles){
        $DestinationFileUrl = $DestinationUrl.Substring(0,$DestinationUrl.ToLower().IndexOf("/sites")) + $DestinationFolder

        Write-Host "Copying '$($File.ServerRelativeUrl)' to '$DestinationFileUrl'" -ForegroundColor Cyan
        m365 spo file copy --webUrl $SiteURL --sourceUrl $File.ServerRelativeUrl --targetUrl $DestinationFileUrl
    }

    Write-host "Document library $SourceFolder is successfully copied to $DestinationFolder" -f Green
}
catch {
    Write-Host -f Red "Error making the list $ListName read-only: " $_.Exception.Message
}
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