Your last sentence is simply unhelpful.
I assume that, like me, you have subscriptions to streaming services (tidal and qubuz in my case) and you carry copies of music/media on your phone/ipad/computer - so the fact you CURRENTLY can access the Roon core/server in your home should be no great loss – if you are travelling for a short while. just go to the source of the streams you access with your Roon core/server and stream your music from them.
Obviously, if you are like me and you tend (before covid) to spend large parts of the year traveling/working away from home then you may wish to access much more than a few songs. So the alternative is to carry your Roon core/server with you - when I first subscribed my core/server used to be on a MacBookPro (MBP) . With Covid lockdowns etc and my spending vast amounts of time at home I moved my home set up onto a Roon Nucleus+ (Plus), which allowed me to free up my MBP.
When the current restrictions are over and I am fully vaccinated against C-19 and everything else I will start travelling again, which means do I take my Roon core/server with me or ?
The following is a pain or costly depending on your view:
a) you could switch your Roon core/server to, from your home system to a laptop when you travel - obviously you need to back up your database/settings first and restore them when you travel. AND obviously anyone else in your home who would access the core/server looses out.
b) you could buy a 2nd Roon license and run 2 cores/servers in parallel - so you do not need to migrate each time. However, since Roon does not sync across cores/servers if you want to access the latest playlists etc then you are in the back-up/restore game again.
Obviously you must have great wifi when you travel and this is quite rare outside of bigger cities and certainly in my favourite camp in the Masai Mara. So I tend to have to travel with music I own on both my phones and MBP.