Excessive versions of outlook pst file backups

OK so I updated Smartware to absolute latest - as of last week - with no change in behavior … updated to 2.4.11.4 on 6/27 and I have 192 of the files (adding up to 154GB )  described above (base file = username@domain.com - outlook(number).pst , excessive backups are username@domain.com - outlook(number)@ long string of letters and numbers .pst) in the outlook folder on the backup.

It seems that adding the extra characters is part of the Smartware process to have historical versions; I have this set to be 3 versions.  Looking at the date/time stamps, Smartware seems to be creating a new backup of the pst files roughly every 2 hours whether the file is used or not and without deleting the past instances.

What is going on? AFAIK it only occurs with Outlook pst files but they eat backup disk space in a hurry!