Blacklist option was added.

/btc <Delaytick> <CopyAir> <File name> [BlacklistBlocks]

Now you can blacklist blocks so the setblock command won't set the block on that/those specific(s) block(s). For example:

(Normal, no blacklist) /btc 1 true thisismyfilename
(blacklist bedrock) /btc 1 true thisismyfilename bedrock
(blacklist bedrock and dirt) /btc 1 true thisismyfilename bedrock,dirt