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How do I import a large Mbox file (more than 30GB) from Gmail into Thunderbird?

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I think I'm supposed to import the Mbox file into Thunderbird's local folder using "ImportExportTools NG" but doesn't Thunderbird local folder have a 4GB limit?

I just want to be able to backup my work emails which use Gmail as an email client (in case of a cyber attack) - is there a better way to back up my Gmail work emails?

I think I'm supposed to import the Mbox file into Thunderbird's local folder using "ImportExportTools NG" but doesn't Thunderbird local folder have a 4GB limit? I just want to be able to backup my work emails which use Gmail as an email client (in case of a cyber attack) - is there a better way to back up my Gmail work emails?

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I have never heard of the 4GB limit.