I can't say I'm very precious about my SD... as in I deem the value on the data on them next to nil. I used to have a (daily?) rsync backup-based solution of my home folder at some point a year ago or so though.
If I was concerned about power outage I think I'd go the UPS route. I think MoPi are working on their next generation mobile power solution and that's something I'd be interested in, when released.
There's a bunch of other solution that could be pulled in, depending on the function of the Pi, for example the Zero LiPo (I haven't tried it, but can't see why not, with a bit of thought on how to switch from PSU to LiPo).