wiki: add WSL2 backup, Fedora43 training env, Ansible upgrades, firewalld mail ports articles; update indexes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

01-linux/distro-specific/wsl2-backup-powershell.md

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+---
+title: WSL2 Backup via PowerShell Scheduled Task
+domain: linux
+category: distro-specific
+tags:
+  - wsl2
+  - windows
+  - backup
+  - powershell
+  - majorrig
+status: published
+created: '2026-03-16'
+updated: '2026-03-16'
+---
+
+# WSL2 Backup via PowerShell Scheduled Task
+
+WSL2 distributions are stored as a VHDX file on disk. Unlike traditional VMs, there's no built-in snapshot or backup mechanism. This article covers a simple weekly backup strategy using `wsl --export` and a PowerShell scheduled task.
+
+## The Short Answer
+
+Save this as `C:\Users\majli\Scripts\backup-wsl.ps1` and register it as a weekly scheduled task.
+
+## Backup Script
+
+```powershell
+$BackupDir = "D:\WSL\Backups"
+$Date = Get-Date -Format "yyyy-MM-dd"
+$BackupFile = "$BackupDir\FedoraLinux-43-$Date.tar"
+$MaxBackups = 3
+
+New-Item -ItemType Directory -Force -Path $BackupDir | Out-Null
+
+# Must shut down WSL first — export fails if VHDX is locked
+Write-Host "Shutting down WSL2..."
+wsl --shutdown
+Start-Sleep -Seconds 5
+
+Write-Host "Backing up FedoraLinux-43 to $BackupFile..."
+wsl --export FedoraLinux-43 $BackupFile
+
+if ($LASTEXITCODE -eq 0) {
+    Write-Host "Backup complete: $BackupFile"
+    Get-ChildItem "$BackupDir\FedoraLinux-43-*.tar" |
+        Sort-Object LastWriteTime -Descending |
+        Select-Object -Skip $MaxBackups |
+        Remove-Item -Force
+    Write-Host "Cleanup done. Keeping last $MaxBackups backups."
+} else {
+    Write-Host "ERROR: Backup failed!"
+}
+```
+
+## Register the Scheduled Task
+
+Run in PowerShell as Administrator:
+
+```powershell
+$Action = New-ScheduledTaskAction -Execute "PowerShell.exe" `
+    -Argument "-NonInteractive -File C:\Users\majli\Scripts\backup-wsl.ps1"
+$Trigger = New-ScheduledTaskTrigger -Weekly -DaysOfWeek Sunday -At 2am
+$Settings = New-ScheduledTaskSettingsSet -StartWhenAvailable -RunOnlyIfNetworkAvailable:$false
+Register-ScheduledTask -TaskName "WSL2 Backup - FedoraLinux43" `
+    -Action $Action -Trigger $Trigger -Settings $Settings `
+    -RunLevel Highest -Force
+```
+
+## Restore from Backup
+
+```powershell
+wsl --unregister FedoraLinux-43
+wsl --import FedoraLinux-43 D:\WSL\Fedora43 D:\WSL\Backups\FedoraLinux-43-YYYY-MM-DD.tar
+```
+
+Then fix the default user — after import WSL resets to root. See [[wsl2-instance-migration-fedora43|WSL2 Instance Migration]] for the `/etc/wsl.conf` fix.
+
+## Gotchas
+
+- **`wsl --export` fails with `ERROR_SHARING_VIOLATION` if WSL is running.** The script includes `wsl --shutdown` before export to handle this. Any active WSL sessions will be terminated — schedule the task for a time when WSL is idle (2am works well).
+- **Backblaze picks up D:\WSL\Backups\ automatically** if D: drive is in scope — provides offsite backup without extra config.
+- **Each backup tar is ~500MB–1GB** depending on what's installed. Keep MaxBackups at 3 to balance retention vs disk usage.
+
+## See Also
+
+- [[wsl2-instance-migration-fedora43|WSL2 Instance Migration]]
+- [[wsl2-rebuild-fedora43-training-env|WSL2 Training Environment Rebuild]]