1. A method to backup and restore one or more clone file trees, the method comprising: generating, by one or more processors, a clone management table; recording, by the one or more processors, in the clone management table, a clone management information about each clone file in one or more clone file trees in a file system; responsive to receiving a backup request, updating, by the one or more processors, the clone management information, and storing one or more data blocks that are in the one or more clone file trees; responsive to receiving a request to restore a clone file, analyzing, by the one or more processors, a clone management information about the clone file, and restoring one or more data blocks in the clone file to the file system; responsive to receiving a request to restore a clone file parent, analyzing, by the one or more processors, a clone management information about the clone file parent, and restoring one or more data blocks in the clone file parent to the file system; and responsive to receiving a request to restore a clone file tree, analyzing, by the one or more processors, a clone management information about the clone file tree, and restoring one or more data blocks in the clone file tree to the file system.