In the event of an Exchange disaster, having key pieces of information is absolutely critical in order to restore your system. With Exchange Server, circular logging is enabled by default . Disabling circular logging is generally recommended and provides additional recoverability . This is because a history of transaction logs are maintained for all transactions. These log files are purged only when a full or incremental online backup is performed and they are no longer needed.
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By default, anyone can create public folders on your system. Get that lump out of your throat and lets walk through an example. A very handy feature for those busy Exchange administrators. Item recovery is not enabled by default. Since Exchange posts transactions to logs before they are entered into the appropriate Exchange database, having the transaction logs on the same physical disk with the databases can create a huge bottleneck .