Quotas showing as 0M in WHM after configuring backups

Symptoms

After configuring or making an adjustment to the backups on the machine, all the accounts in WHM show 0M for the quota. 

Description 

If the backups are configured to be stored in /home on the machine, cPanel & WHM disables the quotas on that partition to improve server performance.  We can see this notification in the output of the "/scripts/fixquotas" command on the system:

root@server [~] # /scripts/fixquotas
journaled quota support: kernel supports, user space tools 
  supports (available)
checking out /home/backup
The system will leave quotas disabled on /home in order to
prevent performance degradation.

You can also see this information in our Backup Configuration pages:

• To prevent performance degradation, the system automatically
  disables quotas on non-root filesystems that contain a
  backup destination.

Workaround

You should configure the server to not store backups inside /home.  The ideal solution would be a separate drive that is only used for backup data.