PowerShell, git, backup changed files.ps1

$TotalNumberVersionsToKeep=100
$BackupFolder = "\\osgdesign\Studio\Windows\Users\v-senefe\Backup" # make sure there is no ending \
$ProjectFolder = "C:\DesignDepot.Git" # make sure there is no ending \
$ProjectFolderName = [System.IO.Path]::GetFileName($ProjectFolder)

Push-Location -Path $ProjectFolder
$changes = CMD.EXE /C git ls-files --modified --others --exclude-standard | Out-String
if ($changes.Length -eq 0){
    Exit
}

Pop-Location

Push-Location -Path $BackupFolder

$dirs = Get-ChildItem | Where-Object {$_.Name -match '^.*\.[0-9]{4}$'} | Sort-Object -Property Name -Descending

foreach($d in $dirs){
    $ext = [int32]::Parse([System.IO.Path]::GetExtension($d.Name).Substring(1))
    # Write-Host $ext
    if ($ext -ge $TotalNumberVersionsToKeep){
        Remove-Item -Recurse -Force $d
    }
    $newName = $d.Name.Substring(0, $d.Name.Length-4) + "{0:D4}" -f ($ext+1)
    Rename-Item $d -NewName $newName
}

foreach($file in ($changes -split '[\r\n]') |? {$_} | ForEach {$($_ -replace "/", "\")}){
    $from = $ProjectFolder + "\" + $file
    $to = $BackupFolder + "\$ProjectFolderName.0000\" + $file
    $toDir = [System.IO.Path]::GetDirectoryName($to)
    # Write-Host $from, $to, $toDir
    if (!(Test-Path -path $toDir)) { New-Item $toDir -Type Directory }
    Copy-Item $from -Destination $to    
}

Pop-Location

powershell script to backup all changed files in git (modified or added) to specified folder
i use it in Task Scheduler to run every hour to be able to roll back or recover from accidental deletions or undos