No, you simply have to format your config-file correctly.
waves:
(4 spaces)default:
(8 spaces)zombies: 10
(8 spaces)skeletons: 7
(8 spaces)spiders: 8
(8 spaces)creepers: 4
Like the warning in the thread says, the backup file is overwritten every time you use /ma dooooo it hippie monster. You can use /ma undo it hippie monster, but it will only restore one of your cuboids. I apologize for the inconvenience.
If you delete the backup file there is no way to restore any of your cuboids. You'll have to use a tool like WorldEdit, or just plain and simple clean it up yourself. I'm sorry that you ended up in a situation like this, but you should have read the warning in the thread :(
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