backup, encrypt (7z), and rotate your wsl distribution via powershell script

backup_wsl2gdrive.ps1

# Requirements:
## install google drive for desktop
## Install 7z.exe
## 7z.exe must be in your Path env variable

# Define your parameters
$wslDist = "<your_wsl_name>" # WSL Distribution
$tempDirectory = [System.IO.Path]::GetTempPath()
$backupFolder = "G:\My Drive\backup\Wsl\$($wslDist)" # Backup destination
$date = Get-Date -Format "yyyyMMddHHmm"
$tarFile = "$($wslDist)_backup_$($date).tar"
$backupFile = Join-Path -Path $tempDirectory -ChildPath $tarFile
$zipFile = Join-Path -Path $backupFolder -ChildPath "$($tarFile).7z"
$zipPassword = "<your_password>" # Set your password
$maxBackups = 5 # Maximum number of backups to keep

# Ensure the backup folder exists
if (!(Test-Path -Path $backupFolder -PathType Container)) {
    New-Item -Path $backupFolder -ItemType Directory | Out-Null
}

# Export the WSL Distribution
wsl --export $wslDist $backupFile

# Ensure 7zip is installed and in PATH, then compress with 7zip and password protect
if ((Get-Command "7z.exe" -ErrorAction SilentlyContinue) -ne $null) {
    7z.exe a -t7z -mx=1 -p"$zipPassword" $zipFile $backupFile
    Remove-Item -Path $backupFile
} else {
    Write-Host "7zip is not installed or not in PATH. The backup couldn't be compressed and password protected."
}

# Get all backup files
$backupFiles = Get-ChildItem -Path $backupFolder -Filter "*.7z" | Sort-Object -Property CreationTime

# Delete oldest backups if exceeding maxBackups
while ($backupFiles.Count -gt $maxBackups) {
    Remove-Item -Path $backupFiles[0].FullName -Force
    $backupFiles = Get-ChildItem -Path $backupFolder -Filter "*.7z" | Sort-Object -Property CreationTime
}