I have a RB4011iGS+RM that I want to install the Dude server on. Specs show the RB4011iGS+RM has 512MB of NAND storage but doesn't mention any external hard drive interface. Is it recommended to install Dude on NAND storage, or should I be using an external HDD? It doesn't seem like the RB4011iGS+RM provides any way to attach additional storage. What do you recommend?

I have a RB4011 in my LAB with the "Dude" installed...
No Problems what so ever for tests or very light Monitoring ...

But if you really want Monitor and Manage multiple devices...
You will need a Mikrotik-Device with removable Storage (USB or SD) or a CHR