The RAID does *not* help against power failures. been there, done that.
rsync will do, but then you have to make sure that the outage does not
occur when running rsync. Anyway it lowers the chance that you'll have
> soudns like overkill as a hedge against drive failure though. drives will fail.
UPS'es don't prevent mechanical drive failure, but they do prevent
'soft' bad sectors. My belief is that these are the most common.
I wouldn't think a 100€ UPS is more overkill than an extra 160G drive
(costing about the same) for RAID/rsync mirroring.
I've made up my mind about this: 'this UPS is to stay', but feel free
not to agree of course ;)