An incremental backup is a type of online backup. An incremental backup is a backup of the transaction log only and can only be used for recovery if you have run a full backup before running the incremental backup. Full backups can be interspersed with several incremental backups.
You must have the BACKUP DATABASE and VALIDATE ANY OBJECT system privileges.
Context and remarks
The backup copies of the database file and transaction log file have the same names as the online versions of these files. For example, if you make a backup of the sample database, the backup copies are called demo.db and demo.log. When you repeat the backup statement, choose a new backup directory to avoid overwriting the backup copies.
For information about making a repeatable incremental backup command by renaming the backup copy of the transaction log, see Renaming the backup copy of the transaction log during a backup (SQL).
Connect to the database.
Validate the database to ensure that it is not corrupt. You can use the Validation utility, the sa_validate stored procedure, or the VALIDATE DATABASE statement.
Make a backup of your transaction log, not your database file. For example, use the BACKUP statement.
The following statement creates an incremental backup of the database in the directory C:\temp\backup:
BACKUP DATABASE DIRECTORY 'c:\\temp\\backup' TRANSACTION LOG ONLY TRANSACTION LOG TRUNCATE;
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