Is it necessary to purge/remove Log entries?

NOBU Support -- Is it necessary to purge (remove) old log entries?  I have been using the NOBU (Norton Online BackUp) since April and it works well.  In the Log there are twelve (12) backup events from 4/11/2012 to 7/4/2012.  Each of the backups ranges from 7.15GB (4/11) to 7.50GB (7/4), with a total space usage of 14.42GB of the available 27.0GB.  Is there a process available to manage the space usage (14.42GB)?  Is there a process available to manage the logs? 

NOBU Support -- Is it necessary to purge (remove) old log entries?  I have been using the NOBU (Norton Online BackUp) since April and it works well.  In the Log there are twelve (12) backup events from 4/11/2012 to 7/4/2012.  Each of the backups ranges from 7.15GB (4/11) to 7.50GB (7/4), with a total space usage of 14.42GB of the available 27.0GB.  Is there a process available to manage the space usage (14.42GB)?  Is there a process available to manage the logs? 

Merged with original thread for better exposure.