Hi There,
Thank you for the opportunity
You are looking to transfer 20 Wordpress sites from a host to another host. On the actual host, you do not have access on files, backups and transfers need to be made through some plugins like Duplicator, Backupbuddy, etc.
Please share access to both hosts and on domain provider to change name servers.
After we complete the process all sites need to be 100% perfectly functional on the new host.
Thanks
Mirth