For one revzalot, /dev/{wd0,wd1} don't exist.. and you can't use "cp" like that either.
To backup a partition, I use either tar or dump, if I'm trying to recover something.. like lost data off a friends thumb drive or w/e, I duplicate the partition with dd...
$ dd if=/dev/rsd0i of=partition-image.img
Then work on the image instead of risking the drive..
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