Staging and upgrade a Magento website

Hi,
I would like to upgrade a Magento website to the latest version, before that i have a staging site as a subdomain, you can try it before move to prod... just we don't want the live site to be affected by any down process...
Hope the task is clear

website : http://bit.ly/3Yg5fg6
Server : CentOS Linux 8.5.2111
Panel : Plesk Obsidian Version 18.0.41

Components

curl 7.61.1-22.el8
dovecot 2.3.17.1-2.centos.8+p18.0.41.1+t220207.2342
dovecot-pigeonhole 0.5.17.1-2.centos.8+p18.0.41.1+t220207.2342
fail2ban 0.11.2-2.centos.8+p18.0.42.0+t220118.0900
httpd 2.4.37-43.module_el8.5.0+1022+b541f3b1
modsecurity 2.9.5-2.centos.8+p18.0.42.0+t220121.0734
mysql 10.3.28-1.module_el8.3.0+757+d382997d
nginx 1.20.2-2.centos.8+p18.0.41.1+t220207.2342
nss 3.67.0-7.el8_5
openssl 1.1.1k-5.el8_5
php71 7.1.33-1centos.8.211108.1944
php72 7.2.34-1centos.8.211108.1944
php73 7.3.33-1centos.8.211118.1928
php74 7.4.33-0redhat.8.221109.0743
phpmyadmin 5.1.1-2.centos.8+p18.0.41.1+t220207.2342
postfix 3.5.9-2.centos.8+p18.0.41.1+t220207.2342
psa 18.0.41-2.centos.8+p18.0.41.1+t220207.2342
psa-api-rpc 18.0-2.centos.8+p18.0.41.1+t220207.2342
psa-autoinstaller 3.41.0-1centos.8.220114.1630
psa-backup-manager 18.0-2.centos.8+p18.0.41.1+t220207.2342
psa-logrotate 3.8.2-2.centos.8+p18.0.41.1+t220207.2342
psa-mod-fcgid-configurator 2.3.9.5-2.centos.8+p18.0.42.0+t220117.1118
psa-proftpd 1.3.7c-2.centos.8+p18.0.42.0+t220118.0900
resource-controller 18.0-2.centos.8+p18.0.42.0+t220117.1118
roundcube 1.4.13-2.centos.8+p18.0.41.1+t220207.2342
rsyslog 8.2102.0-5.el8