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4th chunk of `doc/src/sgml/ref/pg_combinebackup.sgml`
98c87b1329d003684c2ca8c972d215b3b707e1079a92046a0000000100000927
 contain checksum of
        the right type, <function>copy_file_range</function> will be used to
        copy the file, but the file will be also read block-by-block for the
        checksum calculation.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>--manifest-checksums=<replaceable class="parameter">algorithm</replaceable></option></term>
      <listitem>
       <para>
        Like <xref linkend="app-pgbasebackup"/>,
        <application>pg_combinebackup</application> writes a backup manifest
        in the output directory. This option specifies the checksum algorithm
        that should be applied to each file included in the backup manifest.
        Currently, the available algorithms are <literal>NONE</literal>,
        <literal>CRC32C</literal>, <literal>SHA224</literal>,
        <literal>SHA256</literal>, <literal>SHA384</literal>,
        and <literal>SHA512</literal>.  The default is <literal>CRC32C</literal>.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>--no-manifest</option></term>
      <listitem>
       <para>
        Disables generation of a backup manifest. If this option is not
        specified, a backup manifest for the reconstructed backup will be
        written to the output directory.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry>
      <term><option>--sync-method=<replaceable class="parameter">method</replaceable></option></term>
      <listitem>
       <para>
        When set to <literal>fsync</literal>, which is the default,
        <command>pg_combinebackup</command> will recursively open and synchronize
        all files in the backup directory.  When the plain format is used, the
        search for files will follow symbolic links for the WAL directory and
        each configured tablespace.
       </para>
       <para>
        On Linux, <literal>syncfs</literal> may be used instead to ask the
        operating system to synchronize the whole file system that contains the
        backup directory.  When the plain format is used,
        <command>pg_combinebackup</command> will also synchronize the file systems
        that contain the WAL files and each tablespace.  See
        <xref linkend="guc-recovery-init-sync-method"/> for information about
Title: pg_combinebackup Options: Checksums, Manifests, and Synchronization Methods
Summary
The option '--manifest-checksums' specifies the algorithm for checksums in the backup manifest. The option '--no-manifest' disables the generation of a manifest file. The option '--sync-method' determines how pg_combinebackup synchronizes the backup directory to disk. The default 'fsync' recursively opens and synchronizes all files. Alternatively, on Linux, 'syncfs' can be used to synchronize the entire file system.