In order to provide a permanent record of a member's interactions with your credit union, Collections Trackers are retained on the system for the life of the membership, and even get moved to closed account files should the membership/account be closed. 

All other Tracker Types are subject to the retention schedule outlined in Tool #277 Configure Tracker Types.  Most of these are CU-defined, with a few exceptions for standard system Trackers:

Tracker
Type
Minimum Online
Retention Required
Maximum Online
 Retention Period
Audit Trackers (AT) 5 years 7 years
Notice Trackers (NT) 5 years 10 years
Sales Trackers (ST) 6 months 3 years
Collections Card (XX) 10 years Permanent
All Other Tracker Types 6 months Permanent