Backup log is a feature of backup applications that records the events that occur during a backup process. … If and when a problem occurs during the backup process, the log will record the error messages created by the backup application when the error occurred.

What is log in SQL Server?

Every SQL Server database has a transaction log that records all transactions and the database modifications made by each transaction. The transaction log is a critical component of the database. If there is a system failure, you will need that log to bring your database back to a consistent state.

What is the difference between differential database backup and transaction log backup?

A differential backup copies all pages which have been modified since the last full backup. A transaction log backup copies the contents of the transaction log since the last transaction log backup.