How to Undelete Files - Avoid Data Loss Tips
BACKUP is the most important and effective way to avoid data loss. It is recommended to backup your documents and photos regularly (e.g. every day, or at least every week). External hard drive or USB flash drive is a good choice to save the backup files. Once you deleted a file accidentally from your hard drive, you can easily and safely restore it from backup files.
Also, it is recommneded to use disk image or system backup tool to backup your system drive. It will save you much time on system re-installation, and different applications re-installation.