You can use the Commvault software to back up and restore Google Cloud Spanner.
Backups
Data You Can Back Up
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Cloud Spanner instances 
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Cloud Spanner databases 
Backups You Can Perform
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Full backups Note Due to the way Google Cloud Spanner exports databases to the staging path, deduplication is not possible. 
When You Can Perform Backups
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On a schedule: The backup plan that you assign manages scheduled backups. 
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On demand: You can perform on-demand backups at any time. 
Restores
What You Can Restore
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Entire instances 
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Individual databases 
Backups You Can Use for Restores
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The most recent backup: For example, restore the most recent backup to its original location 
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A backup from a specific date: For example, restore data to a point in time before it became unusable 
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Backups from a date range: For example, restore data that was accidentally deleted 
Destinations You Can Restore To
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The current location (in place) - 
Restore an entire instance 
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Restore a database to the instance that it was backed up from 
 
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A different location (out of place) - 
Restore an entire instance to a different project 
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Restore a database to a different instance 
 
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