The answers to the clues below will have something in common:

1. Certain computer key
2. Accumulation of unfinished work or orders
3. Sudden recollection of something from the past
4. Place for something of secondary importance
5. Mountain trail, sometimes
6. Feature than makes something less desirable
7. Reduction in staff or service to save money
8. Strong, adverse reaction by a large number of people
9. Talk maliciously about someone who is not present
10. Deja vu - in a way
11. Start over
12. Start over
13. Start over

Answers:

1. Back slash
2. Backlog
3. Flashback
4. Back burner
5. Switchback
6. Drawback
7. Cutback
8. Backlash
9. Backbite
10. Back to the future
11. Back to the drawing board
12. Back to square one
13. Back to one's roots