I've running a Cubetruck with Fedora 23 as a SOHO-server for a long
time. Only the U-boot is on a small SD-Card, all filesystens are located
on a SSD-Disc attached on the SATA.
It is possible to upgrade to Fedora 24 as a "normal" PC with "dnf
install dnf-plugin-system-upgrade; dnf system-upgrade download