(tar)Crossing Filesystem Boundaries

Operating Only on New Files

Characteristics

Crossing Filesystem Boundaries
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   The `--one-file-system' (`-l') option causes `tar' to modify its
normal behavior in archiving the contents of directories.  If a file in
a directory is not on the same filesystem as the directory itself
(because it is a mounted filesystem in its own right), then `tar' will
not archive that file, or (if it is a directory itself) anything
beneath it.

   This does not necessarily limit `tar' to only archiving the contents
of a single filesystem, because all files named on the command line, or
through the `--files-from=FILE-OF-NAMES' (`-T FILE-OF-NAMES') option,
will always be archived.