backup will fail and be unusable.

</para>

<para>

Thewrite-ahead log files will be written to

the <filename>base.tar</filename> file.

When tar format mode is used, thewrite-ahead log files will be

written tothe <filename>base.tar</filename> file.

</para>

</listitem>

</varlistentry>

requires no extra write-ahead logs to be saved on the master.

</para>

<para>

The write-ahead log files are written to a separate file

named <filename>pg_wal.tar</filename> (if the server is a version

earlier than 10, the file will be named <filename>pg_xlog.tar</filename>).

When tar format mode is used, the write-ahead log files will be

written to a separate file named <filename>pg_wal.tar</filename>

(if the server is a version earlier than 10, the file will be named

<filename>pg_xlog.tar</filename>).

</para>

<para>

This value is the default.