Always perform online backups. This lets you back up Exchange Server databases without shutting them down and losing work time. If you do not perform online backups, not only do you lose valuable work time, but you also run the risk of making costly errors since offline backups are detailed and labor-intensive. When you perform online backups, the agent manages files for you. When you perform offline backups, you must do all of the work yourself. In addition, if you perform offline backups, there is no process for validating the checksum on each page of the database so you cannot detect corruptions and check the integrity of the database.
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