[Samba] backup_samba4 script failing

[Bob of Donelson Trophy]

I am testing the backup script found at
https://github.com/thctlo/samba4/tree/master/backup-script on Ubuntu
16.04.1LTS with Samba 4.5.0 (from source) running. 

When I run: 

root at dtdc03:/usr/sbin# ./backup_samba4 --debug
Command checks : CMD_SAMBA contains : /usr/local/samba/sbin//samba
Command checks : CMD_TDBBACKUP contains :
/usr/local/samba/bin//tdbbackup
Command checks : CMD_LOGGER contains : /usr/bin/logger
Command checks : CMD_TAR contains : /bin/tar
Command checks : CMD_DIRNAME contains : /usr/bin/dirname
Command checks : CMD_CAT contains : /bin/cat
Command checks : CMD_GREP contains : /bin/grep
Command checks : CMD_ECHO contains : /bin/echo
Command checks : CMD_AWK contains : /usr/bin/awk
Command checks : CMD_SED contains : /bin/sed
Command checks : CMD_DATE contains : /bin/date
Command checks : CMD_FIND contains : /usr/bin/find
Command checks : CMD_RM contains : /bin/rm
Command checks : CMD_GETFACL contains : /usr/bin/getfacl
Command checks : CMD_TAIL contains : /usr/bin/tail
Command checks : CMD_CUT contains : /usr/bin/cut
Command checks : CMD_WC contains : /usr/bin/wc
Command checks : CMD_AWK contains : /usr/bin/awk
Command checks : CMD_SORT contains : /usr/bin/sort
Starting backup with ./backup_samba4
Message: checking for previous backups of this day : private
Message: setting date and counter : 2016-11-22-3 for  private
Backup Status private: ok
Message: checking for previous backups of this day : sysvol
Message: setting date and counter : 2016-11-22-3 for  sysvol
Backup Status sysvol: ok
Message: checking for previous backups of this day : acl-sys_vol
Message: setting date and counter : 2016-11-22-3 for  acl-sys_vol
creating sysvol ACL file
Backup Status sysvol acl: ok
Message: checking for previous backups of this day : samba
Message: setting date and counter : 2016-11-22-0 for  samba
/bin/tar: Cowardly refusing to create an empty archive
Try '/bin/tar --help' or '/bin/tar --usage' for more information.
Error archiving:
    /home/backups/dtdc03/samba-2016-11-22-0.tar.bz2
Status: 2 

Apparently the final part of the script is failing but I am having
trouble determining why it will not archive the /etc? 

The only option I changed (at the top of the script) is
"KEEPS_DAYS="yes"". Am I miss understanding the comments? 

Suggestions?

-- 
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Bob Wooden of Donelson Trophy