Glossary entry (derived from question below)
Portuguese term or phrase:
prova documental
English translation:
paper trail
Portuguese term
Brazil
Usamos o e-mail para termos prova documental do que fazemos.
Non-PRO (1): Lumen (X)
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How to tell the difference between "easy" and "pro" questions:
An easy question is one that any bilingual person would be able to answer correctly. (Or in the case of monolingual questions, an easy question is one that any native speaker of the language would be able to answer correctly.)
A pro question is anything else... in other words, any question that requires knowledge or skills that are specialized (even slightly).
Another way to think of the difficulty levels is this: an easy question is one that deals with everyday conversation. A pro question is anything else.
When deciding between easy and pro, err on the side of pro. Most questions will be pro.
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Proposed translations
We use email to have a paper trail of what we do
Here is a definition from wordnet.princeton.edu/perl/webwn:
Paper trail: the written evidence of someone's activities; "this paper trail consisted mainly of electronically stored information"
Nothing wrong with the other answers, though.
Hope this helps and good luck!
Brazil
Carol Ribeiro Yates - Mark-in Marketing Integrado
Your message will always be understood !
Native in: Portuguese 
, English
Works in: Portuguese to English, English to Portuguese, Portuguese to Spanish, and 15 more.
We use e-mails in order to have documented proof of what we do
HIH
We use e-mail to have documentary [or written] proof of what we do
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Note added at 8 mins (2007-02-28 15:24:12 GMT)
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Wow, Carol and Nick, talk about synchronicity! :D
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