>>>When we tell our customers to use a UPS, they undersatnd that we are responsible and want to take care of our customers. Be aware that without a UPS you can never guarantee that your customers won't lose data. Make sure that your customers understand this!
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>>Of course, I agree with you.
>>But this particular user makes backups regularly, and it has printed data so if anything goes wrong with table, user can easily restore database and insert missing data.
>
>So you tell them "nothing is lost - this is the black Friday for which you were diligently saving these copies... now where's the latest backup?".

Something like that, yes, why?