SYSTEM Backup files - SMUSERTASKS - filie is approaching 10 MB on server

SUGGESTED

SMUSERTASKS - if this is too technical of a question we can ignore it(delete).

   As a BW user for 28 years our file SMUSERTASKS has grown to nearly 10MB and takes 4 to 5 minutes to backup or restore (SYSTEM backup) . Should this file be this large and data inside reference to the early 2002 (20 years)? In the ZIP file from a SYSTEM backup, the data is plain text and stored as CSV (comma separated values)

89000+ rows of data

I can tell how old the data is by the USERS that show up in the data

Should this file be auto purging at end of month or year? and is not?   normal  ?

We had this kind of a problem with the audit file , it was purged by Sage in 2012 ---- 1993 to 2012 data

Vince