Task archive
Task Archive stores all your deleted tasks. Every time you delete a task, it is automatically moved to the Task Archive. Task Archive can be opened using Manage - Archived Tasks...
You can easily recover any deleted tasks from the Task Archive.
The Task Archive also stores deletion dates, so you can use it as a history tool or log.
There is a quick find box in the Task Archive which allows you to find deleted tasks.
To permanently delete a task, either delete it using Shift + Delete, or remove it from the archive.

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