Exchange pre-CU Backup

Exchange_pre-CU_Backup.ps1

# Backup all *.config files.
# Backup all supported OWA customization files:
# https://docs.microsoft.com/en-us/Exchange/clients/outlook-on-the-web/customize-outlook-on-the-web?view=exchserver-2016
# https://docs.microsoft.com/en-us/Exchange/clients/outlook-on-the-web/customize-outlook-on-the-web?view=exchserver-2019

$BackupLocation = "$HOME\Desktop\Exchange_pre-CU_Backup\"
$ExInstallRoot = 'C:\Program Files\Microsoft\Exchange Server\v15\'
$OwaAuthDir = '\FrontEnd\HttpProxy\owa\auth\'
$OwaPremDir = '\ClientAccess\Owa\prem\'

$FilesToBackup = @()
$FilesToBackup += Get-ChildItem -Path $ExInstallRoot -Filter *.config -Recurse

$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaAuthDir)" -Filter logon.css -Recurse
$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaAuthDir)" -Filter errorFE.css -Recurse
$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaAuthDir)" -Filter favicon.ico -Recurse
$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaAuthDir)" -Filter Sign_in_arrow*.png -Recurse
$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaAuthDir)" -Filter olk_logo_white_cropped.png -Recurse

$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaPremDir)" -Filter languageselection.css -Recurse
$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaPremDir)" -Filter olk_logo_white.png -Recurse
$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaPremDir)" -Filter owa_text_blue.png -Recurse
$FilesToBackup += Get-ChildItem -Path "$($ExInstallRoot)\$($OwaPremDir)" -Filter office_logo_white_small.png -Recurse

$FilesToBackup | ForEach-Object {

    $CopyDestination = "$($BackupLocation)\$($_.FullName -Replace ':')"

    New-Item -ItemType File -Path $CopyDestination -Force
    Copy-Item -Path $_.FullName -Destination $CopyDestination -Force
}