The Z File System, or ZFS, is a high level file system which is far better than any other file system on the market. It's really reliable and provides the best possible performance for the hosting platforms that use it. What makes it different is that it compares the so-called checksum of all the files on the hard disks that comprise a RAID array in real time and if any file is damaged, it is repaired right away. In simple terms, the very same site files are saved on two or more drives and if there is a problem with a file on one drive, a good copy is used from the other drive so as to restore that file. In comparison, none of the other commonly used file systems features checksums. ZFS is also considerably quicker and its functionality is not influenced by the number of files stored on the servers. The larger speeds also enable backups to be created quicker and more often without affecting the overall performance of the system.