You can delete a recovery point for a protection group only by using DPM Management Shell.
To delete a recovery point
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Use the following syntax to retrieve the location of a recovery point:
Get-RecoveryPointLocation [-RecoveryPoint] <RecoverySource> [-Verbose] [-Debug] [-ErrorAction <ActionPreference> ] [-ErrorVariable <String> ] [-OutVariable <String> ] [-OutBuffer <Int32> ]
For more information, type "Get-Help Get-RecoveryPointLocation -detailed" in DPM Management Shell.
For technical information, type "Get-Help Get-RecoveryPointLocation -full" in DPM Management Shell.
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Use the following syntax to delete the recovery point:
Remove-RecoveryPoint [-RecoveryPoint] <RecoverySource> [-ForceDeletion] [-Verbose] [-Debug] [-ErrorAction <ActionPreference> ] [-ErrorVariable <String> ] [-OutVariable <String> ] [-OutBuffer <Int32> ] [-WhatIf] [-Confirm]
For more information, type "Get-Help Remove-RecoveryPoint -detailed" in DPM Management Shell.
For technical information, type "Get-Help Remove-RecoveryPoint -full" in DPM Management Shell.