How often do you back up your data?
If I am honest – at home never, however work is totally different and I actually do a back-up every hour. This is onto a portable hard drive, which I then take home with me.
Am I being over cautious – no, if there was a fire in my office overnight, whilst I might have lost a lot of paperwork I will still have my precious files.
Is this time consuming? No I am lucky I have an Apple Mac and Time Machine does it automatically for me in the background, I am hardly aware of it doing it.

If you have a PC it might be different – does Microsoft give similar free software? Hewlett Packard sent me an email with a link to some useful tips, here is the link. But I have never used it, therefore am not advocating this in any way.
Of course there is also online back-ups, which can be good as well, I just prefer my little hard drive.
So now I had better follow my own advice and back-up at home!