Managing shadow copies with VBScript

Shadow copies are a brilliant time-saver… I can recover a deleted/overwritten/corruped file in a matter of seconds – or better still, the end user can do it! We currently have a schedule that takes a snapshot of our main fileserver at 7am and noon. While this is quite good, it quickly eats up diskspace, then all the snapshots get ditched and we have to start collecting them again. I wished there was some more complex scheduling and management for the shadows – I would find it far more useful to have more of the recent snapshots, and less of the older ones. Unfortunatly there’s no inbuilt functionality to do this, so I thought it was time to write a script…

I put together the following, it looks through all the snapshots on the system, and will delete those that match the following criteria:

– Older than 3 days and created after 7am
– Older than 7 days and not created on a Monday
– Older than 31 days

Scheduled to run daily, it should work a treat. The amount of snapshots should also stay constant, as once they are older then 31 days they will be removed.

  option explicit

  Dim objWMI, snapshots, snapshot, sDate, vDate, deleteSnapshot

  Set objWMI = GetObject("winmgmts://localhost/root/cimv2")
  Set snapshots = objWMI.ExecQuery("select * from Win32_ShadowCopy")
  set sDate = CreateObject("WbemScripting.SWbemDateTime")

  WScript.echo "Searching for all snapshots..."

  for each snapshot in snapshots

      sDate.Value = snapshot.InstallDate
      vDate = sDate.GetVarDate(True)
      WScript.echo vbCrLf & "Found snapshot... Created " & vDate
      'WScript.echo snapshot.VolumeName

      if (DateDiff("d", vDate, Date) > 7) then
          if (DatePart("w", vDate) <> 2) then
              WScript.echo "Older than 7 days & Not created on a Monday"
              deleteSnapshot = true
          end if
      end if

      if (DateDiff("d", vDate, Date) > 3) then
          if (hour(vDate) > 7) then
              WScript.Echo "Older than 3 days & Created after 7AM"
              deleteSnapshot = true
          end if
      end if

      if (DateDiff("d", vDate, Date) > 31) then
          WScript.Echo "Older than 31 days"
          deleteSnapshot = true
      end if

      if (deleteSnapshot) then
          WScript.echo "*** Deleting snapshot ***"
          deleteSnapshot = false
          WScript.echo "*** Keeping snapshot ***"
      end if


One Comment

  • MT3000 commented on October 14, 2010

    This is exactly what I need. Same problem and I was thinking the same solution. Thank you.

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