Getting a site collection backup in SharePoint 2010

Getting a site collection backup in SharePoint 2010 can be done in two methods.

• Through the Central Admin  

 Go to Central Admin -> Backup and Restore -> Perform a Site Collection Backup -> Give a name and a file location for the backup and click ok.

• Using PowerShell

Backup -SPSite -Identity <site collection host header> -Path <path of the backup file>

Reference: Technet