What backup does Office 365 provide natively?
Office 365 does include some native capability to restore data. For example, information deleted from your mailbox goes into your deleted items folder. If information is deleted from there, administrators have the ability to restore from a secondary ‘system wide’ recycling bin. However data is only held in here for a small period of time (typically 14-30 days dependant on what it is and how Office 365 has been configured), and can also be purged entirely at any time, from which there is no ability to recover.