이중성: "보조 백업 체인"으로 전환

백업 드라이브가 연결되지 않아 duplicity많은 캐시 sigtar와 manifest파일이 삭제되었을 때 이 작업을 실행했습니다.

Synchronizing remote metadata to local cache...
Deleting local /Users/justin/.cache/duplicity/a7190bc7f0d9f083cbc7e03931a8c95f/duplicity-full-signatures.20160608T054248Z.sigtar.gz (not authoritative at backend).
Deleting local /Users/justin/.cache/duplicity/a7190bc7f0d9f083cbc7e03931a8c95f/duplicity-full.20160608T054248Z.manifest (not authoritative at backend).
Deleting local /Users/justin/.cache/duplicity/a7190bc7f0d9f083cbc7e03931a8c95f/duplicity-inc.20160608T054248Z.to.20160610T041839Z.manifest (not authoritative at backend).
Deleting local /Users/justin/.cache/duplicity/a7190bc7f0d9f083cbc7e03931a8c95f/duplicity-inc.20160610T041839Z.to.20160616T043456Z.manifest (not authoritative at backend).

이제 Duplicity를 실행하면 기존 증분 백업을 찾는 대신 전체 백업을 수행하려고 합니다.

실행을 실행하면 duplicity collection-status file:///Volumes/DuplicityBackup/내 백업 체인이 "보조 백업 체인"이 되었고 빈 "기본 백업 체인"이 있음이 표시됩니다.

$ duplicity collection-status file:///Volumes/DuplicityBackup/

Synchronizing remote metadata to local cache...
Last full backup date: Thu Jul 28 22:17:39 2016
Collection Status
-----------------
Connecting with backend: LocalBackend
Archive dir: /Users/justin/.cache/duplicity/a7190bc7f0d9f083cbc7e03931a8c95f

Found 1 secondary backup chain.
Secondary chain 1 of 1:
-------------------------
Chain start time: Tue Jun  7 22:42:48 2016
Chain end time: Wed Jul 27 07:19:47 2016
Number of contained backup sets: 23
Total number of contained volumes: 2329
 Type of backup set:                            Time:      Num volumes:
                Full         Tue Jun  7 22:42:48 2016              2219
         Incremental         Thu Jun  9 21:18:39 2016                20
         Incremental         Wed Jun 15 21:34:56 2016                 6
         Incremental         Fri Jun 17 07:29:49 2016                 1
...
-------------------------


Found primary backup chain with matching signature chain:
-------------------------
Chain start time: Thu Jul 28 22:17:39 2016
Chain end time: Thu Jul 28 22:17:39 2016
Number of contained backup sets: 1
Total number of contained volumes: 0
 Type of backup set:                            Time:      Num volumes:
-------------------------
No orphaned or incomplete backup sets found.             

이 문제를 어떻게 해결할 수 있나요?(즉, 빈 "1차 백업 체인"을 삭제하고 "2차 백업 체인"을 사용하는 것입니다.)