// assumes concepts have been written out
static File backupOtherProgramsConceptsNow(S dbID) {
  if (dbID == null) null;
  File f1 = conceptsFile(dbID);
  if (!fileExists(f1)) null;
  File f2 = fileInSameDir(f1, "backups/concepts.structure.gz.backup" + ymd_minus_hms());
  ret copyFile(f1, f2);
}