Sorry, no online dictionaries contain the exact phrase backing up a claim.
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Reverse dictionary results:
1. support
2. substantiation
3. evidence
4. corroboration
5. validation
6. confirmation
7. answer
8. averment
9. confirming
10. constatation
11. corroborator
12. legitimation
13. proof
14. roboration
15. same
16. verification
17. verified
18. affirmant
19. affirmation
20. assertation
21. assertion
22. attested
23. avouch
24. checked
25. confirmed
26. confirmee
27. confirmer
28. corroborated
29. living proof
30. proof positive
31. responsal
32. supported
33. vindication
34. accreditation
35. affirm

You can look up the words in the phrase individually using these links:   backing ?   up ?   a ?   claim ?
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