If there are issues with archive jobs, you can find information in the following sources:
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Enterprise Vault event log that is located in the Windows Event Viewer.
See Viewing the Enterprise Vault event log for Archiving Option events.
A File System Archiving Option job can only find data to archive if backup sets are on disk. or if the option Allow archiving from backup data that is on a tape device is selected.
More Information
Requirements for both the Exchange Mailbox Archiving Option and the File System Archiving Option