Powershell script to backup IIS sites

IIS_Backups.ps1

<#
    .SYNOPSIS
    Backup IIS sites to an 7zip archive and keep a number of versions

    .DESCRIPTION
    Create date based backups of all IIS site directories by mirroring site directories to a date folder. Create a zip file for each
    mirrored folder with naming convention YYYY-MM-DD-sitename_xx.zip.
    Automatically clean up older zip files setting the number of backups to keep.

    .EXAMPLE
    

#>

function Backup-IISSites 
{

    Import-Module IISAdministration

    # Module variables
    [string]$PROGRAMFILES_DIRECTORY = $Env:Programfiles
    [string]$7ZIP_EXE = Join-Path $PROGRAMFILES_DIRECTORY "\7-Zip\7z.exe"

    # Path check
    If (!(Test-Path -PathType Leaf $7ZIP_EXE)) 
    {
        Write-Warning "Cannot find path 7zip.exe in `"$PROGRAMFILES_DIRECTORY". 7Zip is required.` 
    }

    $sites = Get-IISSite
    $iisSites = "IIS:\Sites\"

    $backupRootPath = "C:\Backup\Sites\"
    $numberOfBackups = 7

    $day = Get-Date -UFormat %d
    $month = Get-Date -UFormat %m
    $year = Get-Date -UFormat %Y


    foreach($site in $sites) 
    {
        $iisWebsitePath = Get-WebFilePath $iisSites\$site
 
        If ($iisWebsitePath -ne $null) 
        {   
            # Mirror site files to date directory with robocopy
            Write-Host "Copying site files to backup directory"
                        
            $backupPath = $backupRootPath+$year+"-"+$month+"-"+$day+"\"+$site.Name       
        
            Write-Host "Backing up $site to path: $backupPath"

            # Run robocopy command
            & robocopy $iisWebsitePath.FullName $backupPath /MIR /XF UmbracoTraceLog* /XD *cache* /NFL /NDL /NJH /NJS
        
            # Create zip files from mirrored site files
            Write-Host "Zipping site ""$site"" to an zip archive"
               
            $zipName = $year+"-"+$month+"-"+$day+"-"+$site.Name.Replace(".", "_")+".zip"
            $zipFilePathAndName = $backupPath.Substring(0, $backupPath.LastIndexOf("\")+1)+$zipName

            $7zcmd = "a"                
            $zipCommand = "`"$7ZIP_EXE`" $7zcmd `"$zipFilePathAndName`" `"$backupPath`""

            Write-Debug $zipCommand

            Invoke-Expression "& $zipCommand" -OutVariable output #| findstr /i /v "Compressing"
        
            Write-Output $output  | Receive-Output

            # Clean up temporary backup folders for creating zip archives
            If (Test-Path $backupPath)
            {
                Write-Verbose "Removing: $backupPath"

                Remove-Item -Path $backupPath -Recurse -Force
            }            
        }
    }

    # Move all older then number of backups zip files to oldzips folder
    $tempPathZips = $backupRootPath+"oldzips"
    If (!(Test-Path $tempPathZips)) 
    {
        Write-Host "Create old zips temp folder"
    
        New-Item -ItemType Directory -Force -Path $tempPathZips

        Write-Host "Moving zips older then $numberOfBackups days"
    
        & robocopy $backupRootPath $tempPathZips /E /MOVE /MINAGE:$numberOfBackups /XD $tempPathZips /LOG+:$backupRootPath\robocopy.log
                
        Write-Host "Remove oldzips folder with older backups"

        Remove-Item -Path $tempPathZips -Recurse -Force
    }
}

function Receive-Output {
    process { Write-Host $_ -foreground Yellow }
}        

Backup-IISSites