Railroader-backup.ps1

# A simple PowerShell script to backup Railroader saves
# Twitter: @Kerbo_
#
$ErrorActionPreference = 'SilentlyContinue'
$railroaderDir = $env:APPDATA + "\..\LocalLow\Giraffe Lab LLC\Railroader\Saves"
$dateString = $(get-date -f yyy-MM-dd_HH-mm)
$maxBackups = 10
Push-Location $railroaderDir

If(!(test-path -PathType container "backups"))
{
      New-Item -ItemType Directory -Path "backups" | Out-Null
}

$saves = Get-ChildItem -Filter *.shortsave

foreach($save in $saves) {
    $savename = $save.Name
    $basename = $save.BaseName

    if($savename -Like "*_auto*") { continue }

    $save_hash = Get-FileHash -Algorithm SHA1 $save
    $backup = gci "backups\$basename-*" | select -last 1
    $backup_hash = Get-FileHash -Algorithm SHA1 $backup -EV Err -EA SilentlyContinue
    if ( $backup_hash.Hash -eq $save_hash.Hash ) {
        Write-Host "$savename matches latest backup, no backup needed" -ForegroundColor green
    } else {
        cp $savename "backups\$basename-$dateString.shortsave"
        $RET=$?
        if ($RET) {
            Write-Host "Copied $basename.shortsave to backups\$basename-$dateString.shortsave" -ForegroundColor yellow
        } else {
            Write-Host "Error! cp returned $RET for $basename.shortsave" -ForegroundColor red
        }
    }
    # Keep only latest $maxBackups backups
    $c = Get-ChildItem "backups\$basename-*" | measure
    $count = $c.Count
    #Write-Host "Using $count out of $maxBackups backups for $savename"
    If($count -gt $maxBackups) {
        $delcount = $count - $maxBackups
        Write-Host "Cleaning up $delcount old backups for $savename"
        Get-ChildItem "backups\$basename-*" -Recurse | sort CreationTime -desc | select -Skip $maxBackups | Remove-Item -Force
    }
}
Pop-Location
# Sleep to show screen output before exiting
Start-Sleep -Seconds 5