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I would recommend using the automated transfer anyway.

Firstly because you can uncheck the box for copying your group members, and have just the content copied. But beware: content in both Yahoo Groups and Groups.io is "owned" by the member who uploaded the content. If the matching email address is not in the Groups.io group then the ownership info is lost, and the item becomes attributed to the person who initiated the transfer. For this reason it is best to let the transfer agent copy over the membership so that as much of the content remains properly attributed as possible.

Secondly, those Y!Group members who have "Bouncing" status will be skipped when copying the members. That alone will trim a lot of your deadwood (though you may mean you have 7800 non-bouncing members). Immediately after the copy operation a number of the copied members will likely get "Bouncing" status in Groups.io. That's because Y!Groups bounce tracking mechanism has been unreliable for some time, and Groups.io will pick up the ones Y!Groups missed. It is also possible in some cases that an email service might reject messages from Groups.io where it had been accepting them from Y!Groups.