Is it possible to set up IRC + weechat + some bouncer to get all messages even if your computer completely turns off?

This might be a silly question (I tried setting up soju + weechat but it will only give me the last 20 messages history if I disconnect), but I have actually been researching it for some time and I'm not sure if I can make such a config! I'll be glad for any ideas or advice you can give me on that. I don't understand detailedly how irc works so this might be part of the source of confusion.

Thank you all in advance!