Always hold a backup copy of all SharePoint Online sites from which you can restore necessary data, even if the contents are purged from the second-stage recycle bin.
Define a retention period for your backups, and automatically discard older backups.
Users experience no downtime of Office 365 services while SharePoint Online sites are backed up.
Back up SharePoint Online, Exchange Online, OneDrive for Business, on-premises Exchange, and Active Directory environments from a single console.