A battery powered
cape for a graceful power-down might be option. I don't have the
knowledge to design/build one (relatively) easily.
On the BeagleBone white, I use a 5F supercap on the "battery" terminals.
When my hardware detects failing prime power it flags an input that my
software watches for. My software then immediately uses the magic-sysrq
to sync disks and remount as read-only, to protect the filesystem. The
supercap provides just enough power/time to do that.
Also, I use full data+metadata journaling on the filesystem (ext4).
It's been very robust so far.
- Mike
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