The archive is a place to store secrets you probably don't need anymore.
It is safer to move a secret to the archive than to delete it just in case your need it again in the future.
Move to archive
To archive a secret navigate to the view secret page.
Then tap the menu button () to show the secret actions.
Tap the Archive item to move the secret to the archive folder.
Notice that the folder name underneath the secret is now Archive.
Restore from archive
To restore a secret from the archive navigate to an archived secret.
Then tap the menu button () to show the secret actions.
Tap the Unarchive item to move the secret out of the archive.
The secret is now in your default Documents folder.