PS_DeleteBlobVersions_BasedOn_LastModified.ps1

#The below PowerShell script helps you to delete the older blob versions based on the Last Modified date of the versions.
#This doesn't delete the Root blob/current version.
#The script can be modified based on the requirements.

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[CmdletBinding(DefaultParametersetName="SharedKey")]
param(

  [Parameter(Mandatory=$true, HelpMessage="Storage Account Name")] 
  [String] $storage_account_name,

  [Parameter(Mandatory=$true, HelpMessage="Any one of the two shared access keys", ParameterSetName="SharedKey", Position=1)] 
  [String] $storage_shared_key,
  
  [Parameter(Mandatory=$true, HelpMessage="Container Name")] 
  [String] $container,

  [Parameter(Mandatory=$true, HelpMessage="Number of days you want to keep the versions")] 
  [String] $number_of_days_old
  
)


$current_date = get-date
$date_older_for_version_to_be_deleted = $current_date.AddDays(-$number_of_days_old)

$containerstats = @()

  $Ctx = New-AzStorageContext -StorageAccountName $storage_account_name -StorageAccountKey $storage_shared_key

      Write-Host "Container List"  $container

      Write-Verbose "Processing container : $container"

      $total_usage = 0
      $total_blob_count = 0
      $version_count =0 
      $version_usage =0
      $blob_continuation_token = $null
    
      $blobs = Get-AzStorageBlob -Context $Ctx -Container $container -MaxCount 5000 -IncludeVersion -IncludeDeleted -ContinuationToken $blob_continuation_token
     
      do {
    
                        
        $blob_continuation_token = $null;

        if ($blobs -ne $null)
        {
          $blob_continuation_token = $blobs[$blobs.Count - 1].ContinuationToken

          for ([int] $b = 0; $b -lt $blobs.Count; $b++)
          {
            $total_blob_count++
            $total_usage += $blobs[$b].Length
            if ($blobs[$b].VersionId)
            {
              
              if ($blobs[$b].LastModified -le $date_older_for_version_to_be_deleted)
              {
              $version_count++
              $version_usage += $blobs[$b].Length
              ##Removes all the older versions based on the number of days given
                Remove-AzStorageBlob -Container $container -Blob $blobs[$b].Name -VersionId $blobs[$b].VersionId -Context  $Ctx
              
              }
            }
          }

          If ($blob_continuation_token -ne $null)
          {
            Write-Verbose "Blob listing continuation token = {0}".Replace("{0}",$blob_continuation_token.NextMarker)
          }
        }
     } while ($blob_continuation_token -ne $null)

      Write-Verbose "Calculated size of $container = $total_usage with Usage of versions"
                        
      $containerstats += [PSCustomObject] @{ 
        Name = $container 
        TotalBlobCount = $total_blob_count 
        TotalBlobUsage = $total_usage 
        VersionCount = $version_count
        VersionUsage = $version_usage
      }


Write-Host "Total container stats"
$containerstats | Format-Table -AutoSize  

Write-Host "YOU CAN IGNORE THE ABOVE EXCEPTIONS AS ITS JUST A CHECK ON ROOT BLOB and deleted version" -ForegroundColor DarkGreen -BackgroundColor Yellow

Write-Host "Deleted the Blob versions succesfully. GO to the container in Azure Portal and check to confirm" -ForegroundColor DarkGreen -BackgroundColor Yellow