People don’t usually bother taking the backup of their important files regularly. Most people do it monthly or yearly or only when they realize that their PC is not in a good state. But it is recommended to take offline backups of your data periodically. And if you are one of those who takes offline backups, you should also check if those backups are working appropriately. While doing so, you might experience the disk I/O error popping on your computer screen. It isn’t a good sign, and it indicates that your computer cannot read the disk. You might even lose all the data you had backed up.