A quick script to download all the unmanaged solutions in a D365 environment, and extracting them to folders, suitable for backing up unmanaged solutions in source control.

backup-dataverse-environment-solutions

# Backup Solutions from Dataverse Environment
# https://gist.github.com/alirobe/17864cb8336ea9dc3d4da61fb5d6a596

### Settings ###
$skipExisting = $false  # change to $true to update

### Script ###
$solutionsList = pac solution list
$solutionsList > solutions-list.txt
$firstLine = 5 # to be changed if output from pac tool changes
$existing = Get-ChildItem -Path . -Directory
$extracted = @()

if ($solutionsList.Count -lt 5 -or -not $solutionsList[4].StartsWith("Unique Name")) {
    Write-Host "Unexpected output format. Ensure you are connected to the correct Dataverse organization and the solutions list is formatted correctly."
}

foreach ($line in $solutionsList[$firstLine..999]) {
    $solution = $line -split ' ' | Select-Object -First 1
    if($line.Trim().EndsWith("True") -or $solution -eq "Default") {
        Write-Host "Skipping managed or default solution: $solution"
        continue
    }
    if ($solution -eq $null -or $solution.Trim() -eq "" -or -not $line.Trim().EndsWith("False")) {
        Write-Host "Skipping invalid solution definition in line: $line"
        continue
    }
    if($existing.Name -contains $solution) {
        if($skipExisting) {
            Write-Host "Skipping existing solution: $solution (turn off skipExisting to updae)"
            continue
        } else {
            Write-Host "Removing existing solution for update: $solution"
            Remove-Item -Path ./$solution -Recurse -Force
        }
    }
    Write-Host "Processing solution: $solution"
    pac solution export --name $solution
    Expand-Archive -Path "$solution.zip" -DestinationPath ./$solution 
    $extracted += "./$solution.zip"
}

foreach ($zip in $extracted) {
    Write-Host "Cleaning up zip: $zip"
    Start-Sleep -Seconds 2 # expansion can sometimes exit prematurely
    Remove-Item -Path $zip
}