If you have only three, you might want to seriously look at getting more. At least 10, more like 20.

It's always good to have a couple emergency restore disks, such as System 6 Emergency Network Access disks. I talk about those in the link in my sig for both 1440K and 800K formats.

Once again, I can't stress the importance of having a reliable network interface. As I said earlier, I'm not sure if you have Ethernet, the 610s only have AAUI, unless you have a NIC, if you don't have it you'd want to seriously look at it.