# Back Up Exchange Databases

For Exchange databases, you can perform full backups and incremental backups.

## What Is Backed Up

When you back up an Exchange database, the following data is backed up:

- Exchange databases and transaction logs

- Information databases

- Public Folder databases

## What Is Not Backed Up

When you back up an Exchange database, the following data is not backed up:

- System state data

- Active Directory data

- Personal Information Stores (PST files)

- Personal Address Books

- Offline folders

To back up these items, use the Windows File System Agent.

## Database Failures, an Unavailable Database, or Database Failover

In a DAG environment, a database failure can occur during a backup for several reasons (such as the database copy becomes unavailable, or the connection to the network is lost).

When a database failure occurs during a backup job, the backup of the database fails, but the overall backup job continues. During the next incremental backup job, the backup of the failed database is a full backup.

However, when a database failure occurs in the middle of a cycle, the next backup job is an incremental backup.

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