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<chapter id="backup">

<title>Backup and Restore</title>

of <application>rsync</> return a separate exit code for

<quote>vanished source files</>, and you can write a driver script to

accept this exit code as a non-error case. Also, some versions of

GNU <application>tar</>consider itan errorif a file was truncated

while <application>tar</>is copying it. Fortunately, GNU

<application>tar</> versions 1.16 and later exits with <literal>1</>

if a file was changed during the backup, and <literal>2</> for other

errors.

GNU <application>tar</>returnan errorcode indistinguishable from

a fatal error if a file was truncatedwhile <application>tar</>was

copying it. Fortunately, GNU<application>tar</> versions 1.16 and

later exits with <literal>1</>if a file was changed during the backup,

and <literal>2</> for othererrors.

</para>

<para>