I am using a Rasberry Pi 4 with external hard drive. If the drive fills up can I just plug a new one in? If their is config what sre the steps?
Which operating system do you have on your computer besides your Raspberry Pi? Windows, Linux, Mac?
Linux
You most likely won’t be able to plug a second SSD into the Pi. It most likely will not be able to power two SSD’s, and I don’t believe Umbrel has built-in support for dual-SSD at this point. You would have to migrate to a single larger SSD, either by copying the blockchain to the new SSD or downloading it over again.