Make sure you updates the server at a time with less users.
Take Full Backup
Back up the server farm before you start the software update installation. You should create a backup of search and all databases. We recommend that you follow these guidelines:
Search: Use the full backup operation from SharePoint Central Administration or the stsadm command-line tool to back up the Shared Services Provider (SSP) that is associated with the index server. The backup operation includes both the SSP database and content index in the file system.
Configuration database and Central Administration content database: Perform a full backup operation by using either the stsadm command-line tool or SQL Server. If you are using SQL Server, use the simple recovery model, so that your transaction log is truncated.
Content databases: Perform a full backup operation with either the stsadm command-line tool or SQL Server to back up all content databases. If you are using SQL Server, use the simple recovery model, so that your transaction log is truncated.
Front-end Web server: If you have customized the front-end Web server or are unsure of the extent of the customizations to your Web applications, we recommend that you make a backup image of your front-end Web server. Make sure that you have a backup of any solution packages that you have deployed on your front-end Web servers.
Step by Step Process
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