publication retention to increase, how to avoid missing metadata after cleanup

I currently use 7 days for subscription expiration setting for my two merge publications, which will cause metadata to clean up very 7 days. Now I need to increase the retention period to be 14 days. How I can avoid missing metadata after cleanup? Microsoft ms151188 (http://msdn2.microsoft.com/en-us/library/ms151188.aspx) warns that publisher may not have enough metadata, which may lead to non-convergence. I want to change this setting without causing any data loss.

Thanks much,

I don't think changing retention setting will cause metadata loss. Of course if you want to be 100% sure, quiesce the system and then change the setting.