CRM 2011 Import Organization on the same server (or how do you create a development sandboxes)

We have a Development CRM 2011 server that includes everything (CRM, SQL, SSRS, etc)  We have several orgs on it.  one of the orgs (CRM01DEV) is our primary org we use for development.  I want to create a copy of it so I can do a proof of concept on some changes.  I thought I would be able to use the "Import Organization..."  in the Deployment Manager.  When I tried I got the following error;

Error while updating organization information: System.Data.SqlClient.SqlException (0x80131904): The DELETE statement conflicted with the REFERENCE constraint "FK_BusinessUnitExtensionBase_BusinessUnitBase". The conflict occurred in database "CRM01Dev_MSCRM", table "dbo.BusinessUnitExtensionBase", column 'BusinessUnitId'.
The statement has been terminated.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Microsoft.Crm.CrmDbConnection.InternalExecuteWithRetry[TResult](Func`1 ExecuteMethod, IDbCommand command)
   at Microsoft.Crm.CrmDbConnection.InternalExecuteNonQuery(IDbCommand command, Boolean capturePerfTrace)
   at Microsoft.Crm.CrmDbConnection.ExecuteNonQuery(IDbCommand command, Boolean impersonate, Boolean capturePerfTrace)
   at Microsoft.Crm.Tools.Admin.DBImportHelper.UpdateBusinessReferences(IDbCommand command)
   at Microsoft.Crm.Tools.Admin.ImportOrganizationInstaller.UpdateOrganizationInfo(Guid organizationId, OrganizationGroupsInfo organizationInfo, String organizationFriendlyName, String organizationUniqueName, Uri reportServerUrl, Int32 PercentUpdateOrganization, ICollection`1 users)

I know I could create a new org and then import the solution from CRM01DEV, but I wouldn't have any test data.

How are others creating sandboxes for development?