Fortunately, it is possible to back up and restore the ESXi host configuration to move it to the new media. Instead, a reinstall of ESXi is needed to the same version.
BACKUP ESXI USB DRIVE INSTALL
There is no easy way to migrate the ESXi install from a USB drive to an SSD. Partially to keep me motivated, and partially to cover the fan noise from the servers as they rebooted, since they are quite loud. I was mainly listening to this song from Two Steps From Hell on headphones while doing this work. I could have gone with something cheaper, and these drives are probably overkill, but I am doing my best to run these machines as if they were production servers. In response, I purchased a number of enterprise-grade SSD to use as the boot device for these servers. There are a number of official articles linked to the KB including an FAQ, but a blog post from John Nicholson was also very helpful in explaining this, and what to do. This is detailed in VMware KB Article# KB85685. In vSphere 7.0U3 and higher, there are warnings added, advising to move away from USB/SD media for boot devices.
Recently, VMware recommended moving off USB sticks and SD cards for the OS install, as the more recent versions of vSphere 7 write more intensively to the boot drive. When these were installed, an internal USB stick was used for the ESXi boot drive, and a disposable drive used for the scratch partition to avoid wear. These are all running VMware vSphere (ESXi) 7.0U2d to support a number of virutal machines. Currently the homelab is running on 3 Dell PowerEdge servers (two R630, one R730XD).
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