So how big should my servers be?

Hey guys, so I'm just now starting to get into Bungeecord and I'm running my proxy bungeecord server on a 8GB ram server right now.
Can I just simply buy a super small package like a 1GB RAM server that hosts my bungeecord proxy server and my other servers like hub and etc more RAM like 8gb?

Or do I need my proxy bungeecord server to be big with RAM also?

Let me know, thanks guys!