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
Backup-spsite -Identity http://yousharepointsitecoll -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
Restore-SPSite -Identity http://CreatNewSiteCollection -path C:\TestBackup.bak
