Reply To: Cannot Save. Error code 3. Please help!!!

InDesign makes a backup of the file periodically – about every 1 or 2 mintues I think. This is saved in backup recovery file (you can view the path in the preferences).

When Indesign crashes and you reopen the file InDesign tries to recover the backup file. It doesn't always work, but it does most of the time.

Remember to File>Save every 5 minutes, it's a good habit to get into. I'd say at the end of the day do a File Save as and call it a slightly different name.

That way you can keep the old versions of files so if something diastrous happens you won't lose all the work you've done.