As Davey has posted on these forums several times in the past, if you require an urgent answer to a query you are best telephoning the support helpline. Davey may not pick up your post for a day or more depending how busy he is on other areas of the business.
To answer your question, as per the other replies it is always advisable to back-up the computer at regular intervals and especially if the computer is being returned for repair. If all Mesh need to do is swap the graphics card then your data should be safe however if another problem is then discovered in testing it may be necessary to either replace the hard drive or format and re-install windows so a back-up is recommended as a precaution.
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