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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_mqq5eltfe64p8o7dr4j2a3ed2b, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
// assumes concepts have been written out
static File backupConceptsNow(Concepts cc default db_mainConcepts()) {
  if (cc == null) null;
  File f1 = conceptsFile(cc);
  File f2 = programInSameDir(f1, "backups/concepts.structure" + (cc.useGZIP ? ".gz" : "") + ".backup" + ymd_minus_hms());
  ret copyFile(f1, f2);
}