You can backup and restore Dynamics 365 databases through the Dynamics 365 Admin Center.
To do this, go to the Admin Center and select Backup and Restore:

Choose the organization to back up and select New backup:

Enter a label and any notes and click Create:

You will see the backup listed with a Creating status:

Once complete the status will be Available. From here you will be able to Edit and Delete:

Note you can only restore sandbox instances, as defined by a setting in your environment:

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