Don't abort when backup files already exist. Don't allow alternative names. Rationale: - When the user wants to revert, he shouldn't be stopped from doing this just because some old backups will be overwritten. - To not clobber important files by accident, alternative names for backup files were disabled. As the backup target now has a fixed name, the user doesn't have to be informed about the backup copy (unless --verbose)

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#!/bin/sh

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hg init

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echo This is file a1 > a

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hg add a

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hg commit -m "commit #0" -d "1000000 0"

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ls

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echo This is file b1 > b

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hg add b

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hg commit -m "commit #1" -d "1000000 0"

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hg co 0

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# B should disappear

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ls