(tar)Operating Only on New Files

Crossing Filesystem Boundaries

Excluding Some Files

Characteristics

Operating Only on New Files
---------------------------

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   The `--after-date=DATE' (`-N DATE') or `--newer=DATE' limits `tar'
to only operating on files which have been modified after the date
specified.  (For more information on how to specify a date,

FIXME: xref Date Formats
   .)  A file is considered to have changed if the contents have been
modified, or if the owner, permissions, and so forth, have been changed.

   If you only want `tar' make the date comparison on the basis of the
actual contents of the file's modification, then use the
`--newer-mtime=DATE' option.

   You should never use this option for making incremental dumps.  To
learn how to use `tar' to make backups,
FIXME: ref Making Backups
   .