It’s all too easy to accidentally wipe out a word, line or page from a document you’re working on. An accidental brush of the hand on a trackpad at the wrong moment can do it. With some apps on Lion it needn’t be a big drama though: just look at an automatically saved older version of the document to get the lost data back. Here’s how.
Secure Empty Trash really gets rid of files in the Trash can.
Erase a drive to remove old files or delete confidential information.
If you want to be quite sure no-one can retrieve the information from an old floppy or other data store destroy it: physically.
If you back up to CDs, use rewritable discs. Then you can erase what’s on there and put new data over the top.
CDs and DVDs hold data, music, movies. Your Mac can handle these with ease.