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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.
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