Cannot BACKUP or RESTORE a database snapshot

<I have problem with sql integration, at backup time show me the following error:

[Critical] From: OB2BAR_SQLBAR@sqlbicl.ccr.co.cr "(DEFAULT)"  Time: 2/1/2016 5:04:34 AM

      Error has occurred while executing a SQL statement.

      Error message: 'SQLSTATE:[42000] CODE:(3002) MESSAGE:[Microsoft][ODBC SQL Server Driver][SQL Server]Cannot BACKUP or RESTORE a database snapshot.

SQLSTATE:[42000] CODE:(3013) MESSAGE:[Microsoft][ODBC SQL Server Driver][SQL Server]BACKUP DATABASE is terminating abnormally