It can be overkill to do these things more than say, once a month or so while performing other maintenance, backups. There was a case a year or so ago where someone was sending unsolicited young porn to all chatters in a particular AOL chat room. They subpoenaed everyone who had been in the chat room, took their computers for analysis... one was an elderly female libarian. Though rare, that kinda stuff can and does happen. I'll look for the article. It is more important to do this stuff daily if your surfing from work where they probably do a nightly backup. Side note on this topic... it's better to be over-informed rather than uninformed. On bulk garbage nights I sometimes grab old computers for parts and repairs as a sort of hobby. It's really astounding what I've found on hard drives. A lot of people don't even bother with simple deletes.