after Migration, where is facebook comments?

Thank you for this Great plugin!!!
I have a question.

<Status>
I migrate my site, and then facebook comments are disappeared in old site.

<Question>
Are this facebook comments stored in wordpress site’s DB or not?
Where is actual data generated from facebook comments plugin?
Are there inn each commentors’ each account?
How can I restore the old comments in migration?

Hope to get reply and You have good days~

– Jonathan from Korea –

https://www.ads-software.com/plugins/facebook-comments-plugin/