DBBACKUP

Not sure I understand your question, are you asking:
- why is your database backup on 2 tapes? If yes, either the database is larger than the tape, you use 2 backup streams.

Or asking?
- do you need to keep 2 database backups? That's entirely up to you. In the event you need to restore your database, how far back do you want to be able to restore the database? That will answer how many you need.
 
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