OOOOOOH
There are more than two types of runs.
My question 1 was because I thought there were only remote server runs and root server runs. As a result the answer didn't really help until I read that archives backdoor thing you gave.
So you can make a run on either
Root/identity
HQ
Archives
R&D
Remote
Those five?
So does the corp have to set up HQ Ice, archives Ice, root Ice, and R&D Ice separately? Seems like they go bankrupt trying to protect things before they even set up a remote server.
If the same ice blob is defending HQ, archives, root, and R&D it seems like that backdoor card you linked has little purpose.
Not quite. Each central server has a "root" which is just physically the area beneath the server (either the identity card, which represents HQ, or R&D, or the Archives pile) where upgrades can be installed. A run on a central server is also a run on its root. Just as you access all cards in a remote server when you run on it, you access all cards installed in the root of a central server in addition to whatever you'd normally access.
The "root" terminology is just to distinguish it from remote servers, where you can install upgrades directly in the server. In central servers, you cannot install assets or agendas, but you can install upgrades in the root.
So when you announce a run, it can be on:
Archives (you access all cards + root, if applicable)
R&D (you access the top card + root, if applicable)
HQ (you access a random card + root, if applicable)
Any remote server (you access all cards in the server)
The corp does have to set up ice on HQ, R&D, and Archives separately. It can be expensive and the runner can exploit this by making less important runs in order to bankrupt the corp before running where they really want to go. Still, the corp is not obligated to rez ice during runs and it is an important skill to know when it is and isn't necessary to rez ice. Plus, some corp players may choose not to protect Archives with ice. This, however, can be exploited with runner cards such as Sneakdoor Beta, which Tables mentioned above.