RAID doesn't really solve sudden-power-loss situations: in fact RAID-5 in
particular can make it much worse (turning small-range corruption into
apparent scattershot corruption).
A UPS, or battery-backing, is the answer (well, moves the failure point:
if it's a UPS, the UPS must fail before you lose: if it's battery-backed,
you often have to lose the battery first, then power, which is likely to
happen because you often have no idea the battery has failed until it's
In conclusion: we all suck, our data is doomed, the Second Law shall
triumph and Sod and Murphy shall dance above our mangled filesystems.