Sorry, no online dictionaries contain the exact phrase not backed up.
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Reverse dictionary results:
1. unsubstantiated
 2. unsupported
3. unverified
4. uncorroborated
5. disproven
6. ill-founded
7. inexcusable
8. no contest
9. nonconstructive
10. nondescript
 11. nonevent
12. nonevidence
13. nonproven
14. nonresponsive
15. pent-up
16. unaffirmed
17. unapproved
18. unargumentative
19. unasked
20. unattended
 21. unattested
22. unbegun
23. unbeknown
24. uncalculated
25. uncalled-for
26. uncollected
27. unconfirmed
28. unconsidered
29. undescribed
30. undetected
 31. undiagnosed
32. undiscerned
33. unevidenced
34. unexpectable
35. unexpecting
36. unexpressed
37. unforeknown
38. unforeseeing
39. unforeseen
40. unforetold

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You can look up the words in the phrase individually using these links:   not ?   backed ?   up ?
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