Walks a set of directory trees just like a DirWalker, but only adds files
to the changed list if their modified date is more recent than the time of
the last backup. This provides a listing of files which have been added or
updated since the last backup.
All files in directories which have changed are added to the changed list as
well in order to handle the possibility of directory names having been
Nested Class Summary
Nested classes/interfaces inherited from class org.apache.commons.io.DirectoryWalker