We can also use this day to defragment our hard drive(s).
Windows guide to defragmenting
Mac users don't have to defragment, apparently.
Recuva is a freeware Windows utility to restore files that have been accidentally deleted from your computer, including files emptied from the Recycle bin, deleted files from digital camera memory cards or MP3 players, and files lost by bugs, crashes and viruses.
(You do have to register with ZDNet first)
A reminder about Matt's simple and effective back-up:
"I have never been able to get the hang of proper backup software and procedures. I always end up getting into a complete pickle about the various full backups, interim backups and how the bloody hell I'd back everything up if my hard-drive became shot with the backup software on it. So these days I just have a complete clone of My Documents on a portable drive and use Microsoft's Synctoy to keep the files up to date."
However I would suggest backing up your entire Documents and Settings folder and not just the My Documents part of it as it which would include emails and favourites/bookmarks. This link has more details.
I asked Lee about the Mac equivalent:
"Things like emails, bookmarks, fonts, templates, RSS feeds, Applescripts - anything used by an application, but not created by it when you hit Save - are kept in your Home folder, in the Library. In Mac speak, that's ~/Library. Apple apps such as Mail, Safari, and iTunes may have their own folders. Non-Apple apps like NetNewsWire, Montage, Final Draft, Scrivener etc, will keep all their stuff in ~/Library/Application Support. The truly paranoid might want to back up their preference files as well. I know I do. These are in ~/Library/Prefences.
For safety's sake, back up the entire Library folder, it's probably only a few hundred megs."
Thank you Matt and Lee!
Don't delay, do it today. It's Back Up Your Files Day, hooray!