Interactive Log Backup 

By using the interactive log backup you can back up all the pages of the log area that have been saved in the log since the last log backup. A version file is also created for the last log segment, which may not have been filled.

Prerequisites

A full data backup of the current database instance has been created.

You can perform interactive log backups in WARM or COLD mode.

While an interactive log backup is running, no further backups can be performed.

See also:

Backup Strategy

Saving Log Backups