Backup and restore SharePoint online site

To back up and restore data in SharePoint Online, we can create an Office 365 support ticket to achieve it.

Contact Office 365 for business support - Admin Help

More information:

The 4 Options You Need to Know About SharePoint Online Backup and Restore

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I hope the above suggestion clarifies your concern, In SharePoint Online, we cannot backup and restore contents as what we do in SharePoint Server 2013. Instead, the backup and restoring features are reflected by the following features: version, template, recycle bin and some third party solutions.

Please follow this links to get more information about backup process in SharePoint Online

https://itsolutionsblog.net/the-backup-options-in-sharepoint-online/

How to back-up a Office 365 SharePoint Online site and data

Restore options in SharePoint Online

Hope this helps!

Migration solution to migrate to-and-from SharePoint and Office 365 along with File Servers, Exchange/Office 365 Public Folders, Google Drive and OneDrive Business to SharePoint Online/On-premise migration.