Cobian Backup mail notifications

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Cobian Backup Post-Backup PowerShell Email Notification KB

Overview

This knowledge base (KB) document explains how a PowerShell script is executed by Cobian Backup after a backup job completes in order to send automated email notifications with backup status details.

Background

Cobian Backup provides options to run scripts before and after backup operations. In this implementation, a .bat script having powershell script is configured in the Post-backup section of a Cobian Backup job. Once the backup completes, Cobian automatically triggers the script. The script parses the Cobian backup logs and sends an email notification with the backup result.

Execution Flow

1. Cobian Backup job starts
2. Backup process completes
3. Cobian triggers the Post-backup event (.bat file)
4. PowerShell script is initiated by .bat file
5. Cobian backup log is parsed
6. Backup status email is sent
7. Script execution details are logged

PowerShell Script

param(
  [string]$Job,
  [string]$DateStr = "",
  [string]$TimeStr = ""
)

$LogFile    = "C:\Scripts\Logs\tally-mail.log"
$CobianLogs = "C:\Program Files (x86)\Cobian Backup 11\Logs"
$SmtpServer = "<ip address>"
$SmtpPort   = 25
$From       = "mail id"
$Recipients = @(
  "reciepent mail id"
)
$User       = "mail id"
$Pass       = "password"

function Write-Log($msg) {
  $ts = (Get-Date).ToString("yyyy-MM-dd HH:mm:ss")
  Add-Content -Path $LogFile -Value "[$ts] $msg"
}

$Status     = "UNKNOWN"
$TotalSize  = "Unknown"
$ErrorCount = "Unknown"

try {
  $latestLog = Get-ChildItem -Path $CobianLogs -Filter "*.txt" |
               Sort-Object LastWriteTime -Descending |
               Select-Object -First 1

  if ($latestLog) {
    $lastLine = Get-Content $latestLog.FullName |
                Select-String "\*\*\* Backup done" |
                Select-Object -Last 1

    if ($lastLine -and
        $lastLine.ToString() -match "Errors:\s*(\d+).*Total size:\s*([\d\.,]+\s*(?:MB|GB|KB|bytes))") {
      $ErrorCount = [int]$matches[1]
      $TotalSize  = $matches[2]
      $Status = if ($ErrorCount -eq 0) { "PASS" } else { "FAIL" }
    }
  }
}
catch {
  Write-Log "ERROR parsing Cobian log: $($_.Exception.Message)"
}

try {
  if ($DateStr -and $TimeStr) {
    $dt = [datetime]::Parse("$DateStr $TimeStr")
    $PrettyDate = $dt.ToString('yyyy-MM-dd')
    $PrettyTime = $dt.ToString('HH:mm')
  } else {
    $now = Get-Date
    $PrettyDate = $now.ToString('yyyy-MM-dd')
    $PrettyTime = $now.ToString('HH:mm')
  }
} catch {
  $now = Get-Date
  $PrettyDate = $now.ToString('yyyy-MM-dd')
  $PrettyTime = $now.ToString('HH:mm')
}

$Subject = "mail subject - $Status"
$Body = @"
Backup
Status     : $Status
Errors     : $ErrorCount
Date       : $PrettyDate
Time       : $PrettyTime
Total Size : $TotalSize
"@

try {
  $msg = New-Object system.net.mail.mailmessage
  $msg.From = $From
  foreach ($rcpt in $Recipients) { $msg.To.Add($rcpt) }
  $msg.Subject = $Subject
  $msg.Body = $Body

  $smtp = New-Object Net.Mail.SmtpClient($SmtpServer, $SmtpPort)
  $smtp.EnableSsl = $false
  $smtp.Credentials = New-Object System.Net.NetworkCredential($User, $Pass)
  $smtp.Send($msg)

  Write-Log "Mail sent OK: Status=$Status Errors=$ErrorCount Size=$TotalSize"
  exit 0
}
catch {
  Write-Log "ERROR sending mail: $($_.Exception.Message)"
  exit 1
}