I have ports controlled but I use containers with http, however it is not exposed to the WAN, only to the LAN, is it equally risky?

Block outgoing traffic, do you mean blocking it at my router or at the level of where I have the container hosted?

In my case, I have Nextcloud on an Ubuntu server, on an old laptop from 2008. With an Atom processor 1GHz, 1 GB of RAM and 500 GB of HDD.

Thanks u

Is it easy to implement? I’m looking forward to starting to use it.

Do you use Adguard Home?