One thing about computers is that it is really the data inside that is important. The price for getting a new one will always be there but if you weigh out the cost of one computer desktop compared to the valuable data you have inside, it is pretty obvious that no amount of money can replace the records and files you created, mostly important when you talk about work or educational means.
It is easy to buy a computer or upgrade it as you wish. But once you lose certain files, trying to recall and bring them back may be too much of a burden if not a lost cause since historical data may no longer be feasible to remember.
Some computers last for as long as 5 years. This is assuming you are doing the proper maintenance for both internal systems and external parts of the standard desktop. Imagine the number of files you have by that time which can be deleted at an instant. It will probably make you break down in tears if you think of it.
There are alternatives. The reason why optical media is offered with your computer is for you to have external backups of files just in case something undesirable happens. Whether it is the standard CDR or DVDR, what is important is you have files safe and stored somewhere outside your computer. Remember, one system crash or accidental deletion can not be undone. Backup your files and save yourself the trouble of headaches such as these caused by tactless actions you may suddenly do.