[your server host]:[your server port]and click "Add server"
Host Factor allows you to upload whatever mods you want to your server. A list of mods can be found here or here. To install any mod on your server:
Host Factor will automatically back up your Valheim saves every ~10 minutes. You can download/upload saves whenever you want with no limit on size.
Locate your save file. Depending on your OS your saves files could be located in different folders. Typically, they
can be found in:
%appdata%\..\LocalLow\IronGate\Valheim\worlds into the address bar in File Explorer
Find the "*.fwl" and "*.db" files for your save
Zip the above files. You can do this on all OS's by right-clicking after selecting the two files and "compressing" them.
Click on your server in Host Factor
In the sidebar that appears, click the "App Settings" button
Under the "Select a save file" section under "Disk", click the upload button.
Select the "*.zip" file you created previously
Navigate to the "Settings" section and under "World Name" enter the name of your "*.fwl" file. For example, if the file was called my_world.fwl, this field would be "my_world".
Click the "Confirm" button in Host Factor.
Since we back up all of your save files, you can access them at any time in Host Factor: