How to archive site page/site ?

Hello,

– Single page: from Site Pages select - “Download” or with PnP PowerShell

Get-PnPFile –Url "/SitePages/MyPage.aspx" –Path "C:\Backup\" –AsFile

– Entire site: with PnP Provisioning

Get-PnPProvisioningTemplate –Out template.xml

– Retention to standard: Create a retention policy in Microsoft Purview.