Workflow logs - Delete or Archive?

Hello

The tables SWW_*, SWWWIHEAD, SWWLOGHIST, SWPNODELOG, SWPSTEPLOG are growing rapidly in our system, totalling over 100 GB. We are considering archiving/deleting old work items, i.e. older than three months that are in status completed.

What are the risks in terms of data integrity / auditability when deleting these logs, in other words, do we have to archive the old work items or can we simply dleete them?

Thanks

Wilhelm