In my experience of running nodes. Having battery backup power is not to be underlooked. IBD is problematic, or slow at best on limited CPU, memory. Can be mitigated quite a bit in bitcoin.conf. I'd defintely try it. 50g free, is going to be a big constraint, which is why I said about IBD. If you can copy the block chaindata across, that's help massively, but then you'd have to choose pruning with say a 500g external SSD (if you can't upgrade the internal drive) and pruning is quite tricky on lower spec hardware, in my experience.

You could fork out for a 1 to 2tb SSD, internal or external, and that would store your entire in blockchain, which is desirable for a LN node, because you don't have all the extra overhead of reorganizing the data when pruning (as well as all wallet transactions)

That's what I'm finding with pruning enabled. LND or your lightning implimentation isn't a huge problem with a small to medium sized node (say, less than 50 channels) on an average processor, with 8 or better still 16gb RAM. But if you want more services, like GUI for your LN node, it starts to require more processing/memory.

What speed is the CPU?