Time based protection of data stored in a source volume of a computer system uses a directory structure to store backups from a storage system. A first backup from a storage system is received. The first backup contains an image of the source volume for a first time. A first time stamp representing the first time is associated with the first backup. The first backup is stored as a first directory indexed by the first time stamp in a top backup directory. A second backup is received from the storage system. The second backup contains an image of the source volume for a second time. A second time stamp representing the second time is associated with the second backup. The second backup is stored as a second directory indexed by the second time stamp in the top backup directory. The first and second directories are linked to a section of the top backup directory at a root of the top directory.