There are several ways to prevent data loss. Here’s a quick rundown of potential methods.
1. BACKUP, BACKUP AND BACKUP AGAIN
There are several products offering ways to make copies of your important files, if not all, therefore, you shouldn't have any excuse to not be able to make a copy of all of the documents you need in case you lose the original ones. You can even have a dedicated backup server. RAID 1 configurations are also nice. This allows your data to be mirrored in case your hard drive fails.
There are also products online that are very useful, as they can automatically backup files. To do this, you need to open the backup program, then, select the folders on your computer that contain all of your important, essential documents such as those work-related, as well as those pictures taken from several events and occasions which serve as your memories. Backup your important documents to a CD or DVD and place it in safe keeping. You can even back up your entire system as an ISO file type. This is a direct image of all of your files.
However, if you cannot afford these kinds of programs, then, you have no choice but to stick to the manual options. Backing up requires you to be disciplined and not be lazy, because you may be regretting it later when you can't look for the file you need.