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Here I am trying to backing up my email data. When I create the zip, it is 8GB heavy file. My plan is to zip and transfer online to box. But box free account only allows 250mb per file. So I am looking for a method to split my 8GB file into 250MB parts.

Can you give me some ideas.

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You can use most of the popular archiver & compressors such as WinRAR or 7-Zip to "split" the file into 250MB archives. I have used WinRAR to demonstrate the sort of thing you would need to do, it is all very similar and 7-Zip has it even more clearly labeled with "split archive" being an option. example

If you have access to a shell then you can "split" the archive.

mkdir emails
split -b 250m archive.zip emails/archive.zip.

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