> [!BackupWaitWalArchive] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_ipc_backupwaitwalarchive.png"></td><td><b>Wait Category</b></td><td>IPC</td></tr><tr><td><b>Mechanism</b></td><td><code>pg_basebackup</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/ResultSet/Materialize">Materialize</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/Network">Network</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>Backup Recoverability Barrier</b>. A physical backup is only useful if you have the WAL records that describe the changes made *while* the backup was running.</td></tr></table>