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Transfer of the mind, definitely. Hardware independence. Plus possibility of backups. Even if your body is completely vaporized in a blast, you can come back if there is a backup of you.

Forget immortality through the extension of the biological life of the body; yonder lies folly.

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The issue with backups / teleporting / transfer of mind is always the question if it's just a copy of you living on, or still the same consciousness. E.g. if you die on the spot, and a copy takes over for you with your memories.

However yes, that would be a much faster approach to space colonisation - it would remove the need for spaceships.

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