automatic backup doesn't work

2014-06-18 16:22:18,760 INFO [scheduler_Worker-3] [atlassian.confluence.upgrade.AbstractUpgradeManager] getExportBuildNumber Backward compatibility for export: Checking...
2014-06-18 16:22:18,762 INFO [scheduler_Worker-3] [atlassian.confluence.upgrade.AbstractUpgradeManager] getExportBuildNumber Build number 4984: "Upgrade to build number: 4
984" - Ok
2014-06-18 16:22:18,762 INFO [scheduler_Worker-3] [atlassian.confluence.upgrade.AbstractUpgradeManager] getExportBuildNumber Build number 4950: "Upgrade to build number: 4
950" - Ok
2014-06-18 16:22:18,764 INFO [scheduler_Worker-3] [atlassian.confluence.upgrade.AbstractUpgradeManager] getExportBuildNumber Build number 4937: "Reindexes all PersonalInfo
rmation objects, creating them for any users that do not have one." - Ok
2014-06-18 16:22:18,764 INFO [scheduler_Worker-3] [atlassian.confluence.upgrade.AbstractUpgradeManager] getExportBuildNumber Build number 4526: "Remove the legacy remotabl
e apps plugin from the user installed plugins" - Ok
2014-06-18 16:22:18,764 INFO [scheduler_Worker-3] [atlassian.confluence.upgrade.AbstractUpgradeManager] getExportBuildNumber Build number 4517: "Migrate all Page Templates
 using a storage format round-trip conversion" - Not Ok
2014-06-18 16:22:18,765 INFO [scheduler_Worker-3] [atlassian.confluence.upgrade.AbstractUpgradeManager] getExportBuildNumber Backward compatibility for export: "Migrate al
l Page Templates using a storage format round-trip conversion" prevents compatibility before 4517

2014-06-18 16:22:33,730 WARN [scheduler_Worker-3] [activeobjects.confluence.backup.LoggingBackupProgressMonitor] beginBackup Begin Active objects backup, change log level
to INFO for com.atlassian.activeobjects.confluence.backup for more detailed logging.
2014-06-18 16:22:35,077 WARN [scheduler_Worker-3] [activeobjects.confluence.backup.LoggingBackupProgressMonitor] endBackup Completed active objects backup.
2014-06-18 16:22:38,777 ERROR [scheduler_Worker-3] [confluence.importexport.impl.BackupJob] executeJob Error while running the scheduled backup
java.io.IOException: No such file or directory
        at java.io.UnixFileSystem.createFileExclusively(Native Method)
        at java.io.File.createNewFile(Unknown Source)
        at com.atlassian.core.util.FileUtils.copyFile(FileUtils.java:461)
        at com.atlassian.confluence.importexport.impl.BackupJob.executeJob(BackupJob.java:87)
        at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.surroundJobExecutionWithLogging(AbstractClusterAwareQuartzJobBean.java:65)
        at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.executeInternal(AbstractClusterAwareQuartzJobBean.java:47)
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
        at com.atlassian.confluence.schedule.quartz.ConfluenceQuartzThreadPool$1.run(ConfluenceQuartzThreadPool.java:20)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)
2014-06-18 16:22:46,863 WARN [http-bio-8090-exec-22] [atlassian.confluence.cache.TransactionalCacheFactory] warning Transactional cache update outside transaction. All upd
ates to this cache should be performed from a thread with a valid transaction context.