Isilon NDMP backup related snapshot management/deletion

We are doing NDMP-DSA backups for EMC Isilon using EMC networker to the Data Domain.

We use the following variables under the “Application Information” section of Isilon client properties in Networker:-

BACKUP_OPTIONS=0x00000100

BACKUP_MODE=SNAPSHOT

BUTYPE=tar

DIRECT=Y

HIST=D

UPDATE=Y

USE_TBB_IF_AVAILABLE=Y

NSR_DSA_NODE=server.domain.local

We are seeing lot of snapshots left behind by the NDMP backup(some get deleted every night and some left behind).

Is that normal and if not then what should I check?

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