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<chapter id="backup">

<title>Backup and Restore</title>

complaints of this sort from real errors. For example, some versions

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 it an error if a file

is changed while <application>tar</> is copying it. There does not seem

to be any very convenient way to distinguish this error from other types

of errors, other than manual inspection of <application>tar</>'s messages.

GNU <application>tar</> is therefore not the best tool for making base

backups.

code as a non-error case. Also, some versions of GNU

<application>tar</> consider it an error if a file is changed while

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

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

if files changed during the backup, and <literal>2</> for other errors.

</para>

<para>