Keeping a copy of all the emails that are sent out of BUZ
BUZ does not save all the documents that have been generated for an order, so if there is an update to an order you won't be able to see the previous quote that was emailed.
If you want a copy of all the quotes sent out you can create an email address, either a free one like Gmail or Outlook or create a new email address in your domain and add the email address to the BCC Field
Anytime a sales rep or customer user emails a quote, you can have a copy saved to the account you created and if there is a dispute or you would like to lookup a previous order you can check the inbox and search for the Order reference.
And because you are using the BCC field the customer wont see this address in the email.
Just a suggestion.