The Journal provides a history of past activity (see

Access past activity

This is particularly useful to restore a task, a page, an event or a person you archived by mistake.

For tasks, it is pretty straightforward; simply untick the checkbox in front of the task.

Alternatively, you can open the archived task and use the Unarchive button at the top.

Finally, there is always the keyboard shortcut; when selected or opened, press ⌘/^ E or ⌘/^ . to uncomplete the task.

Pages are not preceded by a checkbox. To restore a page, open it (double click or ⌘/^ ↵) and click the Unarchive button at the top or use the ⌘/^ ⇧ A keyboard shortcut.