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@echoing-butcher-4609 In the UI volume detail page, you can put your mouse on the processing backup creation, there is a pop-up telling you the backup status and the possible error message Besides, you can check the log of longhorn-manager pods to get the error info:

[longhorn-manager-z5l8m] time="2020-08-24T05:45:25Z" level=error msg="Failed to updated volume LastBackup for pvc-51ef9dd5-999f-4759-ae87-0900dbe16d74 due to backup error failed to put object: backupstore/backupstore/volumes/d6/0e/pvc-51ef9dd5-999f-4759-ae87-0900dbe16d74/blocks/4f/dc/4fdc9348f0b4d4c6dd9a56bde6c5c940044aa063ef19e8157de45f5a4463ead6.blk response: {\n\n} error: AWS Error:  Forbidden Forbidden <nil>\n403 \n"