How to include extra nginx conf file that save in backup and auto include with nginx.conf even if regenerate nginx conf file

how to create extra nginx conf file to home/admin/ conf/web/ that automatically include with domain nginx.conf.
what should be actuale file name and auto including if regenerate nginx conf.

i created extra nginx rewrite conf file via root ftp
at /home/admin/conf/web/
but this file included with nginx but not restore from backup.

is necessary to file owner admin for backup?
and if upload files via root ftp to public_html is good for backup/restore is any file igonre by backup or restore?

thank you,