Embodiments of the present disclosure relate to method, electronic device and computer readable medium of file management. The method comprises: generating an index structure of files in first backup data created at a first point of time, the index structure at least indicating a file name and associated path information of each of the files, the first backup data being incremental backup data relative to second backup data created at a second point of time prior to the first point of time; determining, for a folder involved in the first backup data, existing files that have been present at the second point of time in the folder based on the second backup data; and identifying files modified between the first point of time and the second point of time in the folder by determining whether the index structure comprises index items of the existing files. Accordingly, the modified files can be quickly identified and the computation complexity can be reduced. Moreover, the processing can be efficiently executed for larger backup data.