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Microsoft provides out-of-the-box backup capabilities for SQL Server via the Backup command. Although these native SQL Server data backups work, they don't scale well. Database growth or an increase in the number of databases or SQL Server instances makes the native backup capabilities ineffective. So, a third-party backup solution should be considered essential for a production SQL Server deployment.
Scalability isn't the only challenge that comes into play. It's important to consider the amount of time that it takes to perform a recovery operation.
Some sites recommend making a full SQL Server data backup on a weekly basis and then backing up transition logs every few hours. This approach works, but you have to consider the volume of data that could potentially be lost in a failure (everything that has been written to the database since the most recent successful transaction log backup) and the length of time that will be required for a restoration.
Depending on the circumstances, a restore operation could require you to recover a lot of transaction log backups, which is tedious, time-consuming and potentially error-prone. You can greatly reduce the number of transaction log backups to be restored by performing some periodic differential backups.
Differential backups should be run on at least a daily basis, but in some cases it is more effective to run differential backups every few hours. In the event that a recovery operation is required, you would need to restore the full backup, the most recent differential backup, and any remaining transaction log backups. The end result should be that you have to restore far fewer backups than you would if you were relying solely on a full backup and a bunch of transaction log backups.
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