Always have a backup of your work. I have made this mistake and when a program goes under on you, you loose everything you has on there site that you have not backed up.
This goes even for programs that you have been using for 10 to 15 years, you just never know what is going to happen in this day and age.
No I am not trying to sell you anything just save you major headaches. It will happen to you if it has not already.
Backup on your hard drive or even better a zip drive or a external hard drive.
No this is not a long post, but it is a very important post that I hope for your sake you remember