Problem

When logging into Bamboo, you see a banner saying "Bamboo failed to run the backup on DATE. See the logs for further details."

The following appears in the atlassian-bamboo.log

2016-10-14 21:08:24,604 ERROR [scheduler_Worker-1] [ScheduledBackupJob] java.io.IOException: <artifact file path> (not a file)

Diagnosis

Environment

• Scheduled artifact backup enabled

Diagnostic Steps

To rule out the issue being file corruption, you can run the following to see if the files are valid:

• jar -tf <filename>
• file <filename>

Cause

When configuring scheduled backups, Bamboo requires the configuration of a "Backup file date pattern" to differentiate between backup files. That said, this field accepts any pattern letters per https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html so it is possible to create naming conflicts. For example, if you define a simple pattern such as "Day name in week" (pattern letter 'E'), Bamboo will attempt to create a backup file with a duplicate filename (in one week). 

Workaround

Prevent the file naming conflict:

Option A: 

Change the naming pattern of backup files in Administration >> Scheduled backups

Reference: https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

Option B:

Move the backup files out of bamboo backup directory to another location before the next scheduled backup.