Even 8GB is not that much atleast 16 GB will give more space for core to stress the system and if someone wants to download full node then it must be around 650GB so make sure you have atleast 700GB for running your full node and NVMe is recommended since R/W will be faster and it's more reliable.
On OPs VPS Bitcoin Core seems to run fine with 4GiB RAM. I never had issues running Bitcoin Core on my Raspis which have 8GiB RAM, but more is better, especially to speed up initial blockchain download for which you want to raise dbcache value preferably to around 12 GiB. But if you're patient it works fine with less. Not to mention if you want to run an Electrum server on the same device.
For a non-pruned, full archival node you need
more space. Here's what one of my nodes consume as of right now (I've
txindex=1 and the blockfilter stuff enabled):
Previously I ran Bitcoin core on my potato laptop, basically 24/7! Although it had some ups and downs, it worked without any issue there.
i5 8th gen, 256 SSD, 8GB. So I guess 8gb is still manageable somehow, if we are to tweak some settings here and there.
Running the full node, that seems like a lot of space! Despite having 2TB (current system) of storage, I set pruned size at 10gb only! For some reasons my /C drive is getting filled everyday. It was showing blue the previous day and now it's red. The other day, I deleted the temp files and it was around 30-40 gb, is it normal though? Can't figuare out why temp take this much space.