There should be an option so your tasks and sub-tasks to can't be easily deleted or perhaps I overlooked this setting.
1
vote
Heath
shared this idea
Hi,
Please visit https://checklist.uservoice.com/knowledgebase/articles/1920364 to see how to restore a deleted checklist.
The Checklisters
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Rell commented
Already a suggestion. You can find it currently under the "Top" tab. I think you should add your vote there.