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All they would need is few KBs for every user. They can as well just email the exports to people in case they didn't turn up to collect the export themselves (maybe missed the email or are in the woods trekking or whatever). Either as attachments or hosted somewhere they won't delete in 2 weeks.

(Though it shouldn't be a problem for those who have it in their sent boxes, but some even wrote on the website sometimes like I did).

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