Always backup your work!
Always make copies of the data!
It sounds so simple but for many individuals and small companies it is so hard to keep. Recently I was visiting a small company and I asked the question “Do you take backups?” The answer was “Yes”. I continued the conversation by asking how the backup is taken and what the procedure was. The answer was that the data was copied on a rewriteable DVD disk. I asked, “Do you have one for each day of the week and rotate them?” The answer was “No, I am using only one”. “And what will happen if after you have erased the disk to get it ready for the backup you experience a hard disk failure?” I got no answer to my question. I proposed a very basic system for backup. At least use two disks. Use one disk on the even days and use another disk on the odd days. And keep the backups in a fire safe and secure place. It is amazing how many people do not make backups or make backups the wrong way. Everyone has the feeling that the disaster will not strike.
Do not take any chances.
Backup your valuable data frequently and correctly.
Back in the old days, a small company was using diskettes to take backups. One day, my phone rang and they told me that their files were corrupted. Naturally, I suggested using the backup diskettes. They told me that the diskettes where not working. I told them to use the alternative set. The result was the same. I went to the main office of the company. I asked the person in charge to tell me what he did. He told me that before calling me he did a backup to both the sets just to be sure. He had copied the corrupted files destroying the backup.
Always backup your work and do not destroy your backups!