Migrate Magento code to another server

SSH to both servers old one (server A) and a new one (server B)

you need to Copy the files legacy server A :

Archive it first

tar -czvf magento.tar.gz app/code/

move to the public dir server A:

 mv magento.tar.gz pub/

Go to new server B web dir. for example :

cd /var/www/html/

Download files to the new server B:

wget https://www.{domain}.com/magento.tar.gz

Untar files on a new serve B:

tar -xzvf magento.tar.gz -C magento

remove a file on the old server B:

rm pub/magento.tar.gz 

In the next step, you will need to dump Magento DB. See my other posts.