5 Dedicated servers.
2 from soyoustart and 1 gaming from ovh. 2 are used for hosting and another one for kvm servers, and the gaming one is used for a personal private project. (which i sadly will terminate 2 servers from soyoustart next month)
2 from hetzner used for some personal projects.
4 vps from m247
and around 10 vps from ovh used for different things
in one mysql server (mariadb 10.2)
in one mail server (postal app)
in one proxy (not that kind of proxy, but site proxy used as failover in case of ddos attacks)
in one just webserver (Nginx plus)
in one cache proxy (varnish)
one as backend (apache)
in one as static file storage (i'm just using nginx for it and mostly i host my heavy files which i don't want to upload on github because i don't like abusing github bw but i will close this as now i've start of using ovh storage containers and it looks cheap then using a vps for it)
in one a software as api to make my things easy (i was doing a api system by myself but i'm moving to 'fusio')
in one restream server with rtmp and nginx. (nginx and rtmp module)
in 2 some gaming stuff (one x server on x fastdl)
i also have 3 vps from aws hosting discord bots.
and i currently don't remember others but yeah it's super expensive but this is the way to go if you want a super fast and secure site/business.
btw those are not all for myself, i also "offer" this to some of my friends which have business sites as they have problems with ddos attacks and spammers.
to handle attacks and other things is not easy or something which you want to do!!
but i do this just because i want to learn how to deal with those things!. So that's how i've learn most of things by trying..