The process of files getting damaged owing to some hardware or software failure is referred to as data corruption and this is among the main problems which hosting companies face since the larger a hard drive is and the more information is filed on it, the more likely it is for data to get corrupted. You will find different fail-safes, but often the info gets damaged silently, so neither the file system, nor the administrators detect anything. As a result, a corrupted file will be treated as a good one and if the hard disk is part of a RAID, that particular file will be duplicated on all other drives. In theory, this is done for redundancy, but in practice the damage will be even worse. The moment a given file gets corrupted, it will be partially or fully unreadable, therefore a text file will not be readable, an image file will show a random combination of colors if it opens at all and an archive will be impossible to unpack, and you risk losing your website content. Although the most widely used server file systems feature various checks, they frequently fail to detect some problem early enough or require an extensive time period to check all files and the web server will not be functional in the meantime.