That depends on who set the server up.
Servers provisioned by Laravel Forge
Yes. Ploi can take over a Forge server as it is: same machine, same IP address, sites stay online. Ploi connects over SSH, scans the server and registers the sites, users, certificates, databases, daemons, cronjobs and firewall rules it finds. You start it from Servers, Create server, Import server. The steps, what changes on the server and what to do about certificates are in How do I migrate from Laravel Forge?.
Servers from ServerPilot or RunCloud
Not yet. Those platforms run their own builds of NGINX and PHP, so an import has to replace more than on a Forge server. We are working on it. Let us know through support if you are waiting for one of these, it helps us decide what comes first.
Servers you set up yourself or with another panel
No. Ploi does not know what is installed, how it is configured or which directory layout is used, and guessing wrong would break your sites. Create a fresh server in Ploi instead, add the sites there and move the files over with git, SFTP or rsync. Databases move with a dump and import.
