Enabling Active Directory Recycle bin
The Recycle Bin is an organizer where records and folders that one have deleted are put away. They have not been for all time expelled from your hard drive(s), they were just moved to this unique folder called Recycle Bin. In a similar manner, any firm would definitely show interest in having a recycle bin enabled for the Active Directory for various reasons.
Start > server manager > Tools > Active Directory Administrative Center > Open the Domain > In the Tasks click on Enable the Recycle bin...> OKas shown in the figure.

Active Directory server Backup
Start > Server Manager > Tools > Windows Server Backup > Local Backup > In the Actions menu select Backup once.. > Follow the onscreen commands > Select Full server backup (Recommended) / Custom backup > Local Drives are the preferred storage type > Select the supported hard drive for the backup destination.

A system hard drive is an unsupported volume for the server backup
It is a best practice to create a separate non sys-drive for in particular with the server backup.