If you want to take backup/restore your site collection in SharePoint, we can do with PowerShell Commands.
Backup site collection in SharePoint using PowerShell.
Backup-spsite -Identity sitecollectionname -path location to store the back up.
Ex: Backup-spsite -Identity http://centralizemedia -path C:TestBackup.bak.
Restore site collection in SharePoint using PowerShell.
Restore-SPSite -Identity create new site collection -path location to restore the back up.
Ex: Restore-SPSite -Identity http://centralizemediaNewsitecollection-path C:TestBackup.bak