[issue43265] Improve sqlite3 backup error handling

[Berker Peksag]

Berker Peksag <berker.peksag at gmail.com> added the comment:

I'm not sure about 1) because if target == source it means a user error. OperationalError is usually used for non-user errors.

3) sounds good to me if that part is already covered by tests and they passed.

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<https://bugs.python.org/issue43265>
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