Backups failing

Our backups are consistently failing (both incremental and full). Here's the error from the logs:

2017-08-21 16:09:16,273 [art-exec-4] [INFO ] (o.a.c.CentralConfigServiceImpl:418) - Exporting config...
2017-08-21 16:09:16,321 [art-exec-4] [INFO ] (o.a.s.ArtifactoryApplicationContext:839) - Exporting security...
2017-08-21 16:09:16,329 [art-exec-4] [INFO ] (o.a.s.a.AccessServiceImpl:709) - Triggering export in access server...
2017-08-21 16:09:16,332 [art-exec-4] [ERROR] (o.a.s.a.AccessServiceImpl:720) - Error during access server backup: HTTP response status 302:Found

The backups themselves are still generated and seem complete, although they may be missing some configuration data I'm not aware of. However, this is still very problematic since 1) every backup triggers an e-mail stating the backup failed, 2) since Artifactory doesn't consider these successful backups, old backups never get deleted.