I think backups, prussiks, autoblocks on raps are a load of crap, where do you stop? Do you tie yourself in when you approach a chain that is close to the edge, if so how close?
You need to be careful every time you thread your belay and double check everything and not be complacent near the edge. If you need to backup your raps just in case you didn't thread it properly find a new hobby this one is not for you.
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