An apparatus being connectable to a computer and another apparatus, the apparatus (300; 310) being configured to manage a first file system and to create a first tree structure of the first file system linking between at least one first parent directory and one or more first child file system objects of the first parent directory based on a second tree structure of a second file system received from the other apparatus (400; 410), the second tree structure linking between at least one second parent directory and one or more second child file system objects of the second parent directory existing in the second file system managed by the other apparatus (400; 410), the second parent directory being associated with the first parent directory and the one or more second child file system objects of the second parent directory being associated with the one or more second child file system objects of the second parent directory, wherein, for creating the first tree structure of the first file system, the apparatus (300; 310) is configured to create virtualized file system objects in the first file system, each virtualized file system object of the first file system being associated with a respective file system object existing in the second file system; wherein, when the respective file system object existing in the second file system is a file, the respective virtualized file system object of the first file system is created as a respective external link object which includes an information section indicative of metadata including file attributes of the associated file in the second file system to enable the apparatus to locally handle received attributes request after creation of the respective external link object, the apparatus being configured, upon receiving a read attribute request for the associated file in the second file system from the computer, to locally read corresponding file attributes from the respective corresponding external link object in the first file system and to return the requested attributes to the computer; wherein the apparatus is further configured, when receiving a request for changing file attributes of the associated file in the second file system from the computer, to change the file attributes in the respective corresponding external link object in the first file system according to the request for changing file attributes and to issue the corresponding request for changing file attributes of the associated file in the second file system via the respective external link object to the other apparatus; and wherein, during creating the first tree structure of the first file system, the apparatus (300; 310) is further configured to change a first status of the at least one first parent directory of the first tree structure of the first file system based on creating metadata of the one or more first child file system objects of the first parent directory in the first tree structure of the first file system, the metadata of the one or more first child file system objects of the first parent directory being created based on metadata of the respective associated one or more second child file system objects of the second parent directory of the second tree structure of the second file system received from the other apparatus (400; 410).