Revert "added backup"

This reverts commit a5cf194f45deb95e49c238a5d9e737b5f50a017e.
Revert "changed nav bar"

This reverts commit 2b9e79306ab96e19f7b83de353bb4d09d52533ea.
Revert "advanced re-entry strategy"

This reverts commit a3f4142db1734d309a2a935c78c79566eccbee7a.