ZFS, which is short for Z File System, is a cutting-edge file system which provides better performance for sites and online apps. One of its key advantages is the real-time checksum comparison - every file has a checksum, or a digital fingerprint, and ZFS compares the checksums of all files between the several hard disks working together in a RAID. If any file is corrupted for any reason on one of the hard drives, it is repaired from another travel with the correct checksum. This way, the integrity of any file located on a hosting server is guaranteed at all times. ZFS also functions considerably quicker than other file systems, which allows backups to be created considerably faster and without slowing down the general performance of the entire hosting server. Also, ZFS doesn't have a set limit for the total amount of files which could be stored on a server while all other file systems have some restriction which might cause issues sooner or later, especially for script programs that have a lot of files.