Hi,
It best to separate the server backup and client backup into two hard drives.
Once you set up the Server Backup, the drive will be hidden. So, if you set up the client backup in the same drive, you will not be able to read the client backup.
Also, 6 TB is usually not enough to cover both server backup and client backup.
So, in order to reset up the backup in the future, you'e better to setup the server and client backup separately into two hard drive.
Thanks,
Eleven