Tape collocation

With DPM 2007 SP1 you can use Tape Collection or Tape media sharingso that multiple protection groups with similar tape retention periods can now share tapes. This enables you to have multiple recovery points from the same as well as different protection groups use the same tape.
To enable (from DPM management Shell): Set-DPMGlobalProperty -DpmServer -OptimizeTapeUsage $true
To disable(from DPM management Shell): Set-DPMGlobalProperty -DpmServer -OptimizeTapeUsage $false

Requirement: Protection group must have the same tape retention period configured.