Log shipping is one of the high availability method in SQL server.It is used to keep the entire database in different servers.

• We need 3 servers required to configure the Log shipping.

1. Primary Sever.
2. Secondary Server.
3. Monitor server(Optional).

• Log shipping it works with Backup,Copy and Restore jobs.

Primary Server: 

• Primary server is called as a production server.
• In Primary sever SQL Server database is in Online sate.
• Backup jobs are created in Primary server,

Secondary Server:

• Secondary server is called as a DR(Disaster Recovery) server.
• In secondary server SQL Server database is in Standby or Restoring mode,
• In secondary server T-log backups are applied either Standby or No-recovery.
• Log shipping it can allow multiple secondary servers.

Monitor Server: 

• Monitor server also called as Optional server.
• If a log shipping using monitor server, The alter job is created,
• It maintain status of Backup,copy and restore operations and raise alerts if any operation fail.

Advantages: 

• To reduce down time of the application.
• To implement the load balancing, i.e We can allow reading or reporting from secondary server.
• Multiple secondary servers can be configure.
• Low maintenance.

Click Below Links:

POA for Log Shipping Creation

Types of SQL Server Backups