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I am not a Sony Vegas user, but m2t files are the mpeg-2 compression format that HDV videocameras record to mini-DV tapes. So if you can back those unedited m2t files up to mini-DV tapes or hard drives, those will be the original quality as recorded to camera tapes.
If you did edit and export to m2t though there will be a slight (practically imperceptible the first time) generation loss though which will accumulate with each generation.
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