Since JetBackup 5 for Linux does not have an associated panel to gather account information, JetBackup 5 must calculate these details manually. In order to do this, you must have the repquota tool installed on your Linux server. For more information on how to install the repquota tool, please visit their documentation: repquota.
Once repquota is installed and configured run the following command to verify:
repquota -a
You should get a list of all the linux users on your system along with their configured Disk Usage/Inode Usage Limits. After verifying the command works properly, restart the jetbackup5d service to re-sync the accounts.
/usr/bin/systemctl restart jetbackup5d