Can't boot mac or fix it with disk utility I can't boot my Mac in any way, not even from my backup HD. Disk Utility and fsck says

Missing directory record (id = 33496403)

What can I do now?
El Capitan on MacBook Pro late 2008.
If you have a backup I'd recommend formatting the drive, reinstalling macOS and restoring from backup.
If you don't have a backup you could try 3rd party tools like Alsoft DiskWarrior or Micromat TechTool to repair the volume. Alternatively you could manually back up data via Terminal or by booting from an external drive (and using Finder) if the volume still mounts.