For many users, these backups and storage strategies work as planned. Others, however, are not so lucky. They fail because the systems are designed with a set of requirements that rely on a combination of technology and human intervention for success. In reality, hardware can fail. Tapes and cartridges do not always work properly.
Backup software can become corrupted.
Users accidentally back up corrupted or incorrect information. Backups are not infallible. Protect electrical components by using computers in a dry, shaded area that is clean and dust-free. Do not shake or remove covers on hard drives or tapes. Even the slightest movement can cause a head crash or misalignment of the platters.