>>27950yes, set it on a LAN and don't forward ports
As for the modern mac thing, you'll either want HFS or Fat32, but the reason old PPC macs are like that is because the new machines run GPT and are backwards compatible with MBR, but APM partitioning is something of the classic mac era that stuck around for ppc just long enough to be enshrined in OSX, where you can read it today. With a modern Mac you gotta go through disk utility and format the drive Apple Partition Map and HFS filesystem to get that old stuff to work.