When you delete a tree, you will receive a warning message like this:

Deleted trees cannot be recovered. Rather than deleting a tree forever, consider these options instead.

• Export your tree to JSON prior to deleting it. This will allow you to keep a local copy that can be imported later should you need to recover it.
  or
• Create a folder and name it "Archived Trees" or something similar. Rather than deleting trees, place them in this folder for safekeeping.

• Delete a tree
• Export a tree to JSON
• Creating and managing folders