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Unfortunately, under Oregon contract law, the faxed copy is sufficient to hold you legally liable for the personal guarantee.
When an original copy is not produced, a party to a lawsuit may introduce a copy into evidence as long as they explain why the original is not available (e.g. lost). In this case, since you retained the copy, they can simply assert that fact and the duplicate will be accepted.
In addition, they can serve you with a production of documents discovery request and you would be obligated under Oregon law to provide the original.
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