Depending on the licensing model you have subscribed to, you may be eligible to access some native services provided by Microsoft that can provide some secure cloud strategy & protection to your data using a retention policy. These services allow you to retain data even if deleted by the user within your Exchange, OneDrive, SharePoint, and Teams services.
Unfortunately, a retention policy only allows you to recover the data, but not the configuration or structure of a mailbox, OneDrive or SharePoint site. In addition, if an account becomes corrupt, infected by malware or breached by a ransomware attack, then this also impacts the data within the retention policy.
Read below to understand more why you should consider using a 3rd party backup service for your Microsoft 365 Migration data.