<para>

When a custom <xref linkend="guc-archive-library"/> is configured, PostgreSQL

will submit completed WAL files to the module, and the server will avoid

recyling or removing these WAL files until the module indicates that the files

recycling or removing these WAL files until the module indicates that the files

were successfully archived. It is ultimately up to the module to decide what

to do with each WAL file, but many recommendations are listed at

<xref linkend="backup-archiving-wal"/>.