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