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Druva Documentation

NAS share backup workflow

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This article provides the workflow diagrams and steps for data backup of NAS shares on Windows and Linux. 

Backup workflow

The following workflow illustrates the data flow during backup of NAS shares on Windows or Linux: 


The following table summarizes the workflow steps. 

Step Operation

Step 1

 A backup request is initiated and forwarded to the NAS proxy. 

Step 2


Druva checks if the NAS proxy is running. 

  • If the proxy is running, Druva performs the backup.
  • If the proxy is down, Druva performs the backup based on the type of backup job, as specified below.
    • For a backup now job, Druva queues the backup request. Druva completes the request after the NAS proxy starts.
    • For a scheduled job, Druva skips the backup request.

Step 3


Druva determines the type of backup.

If it is the first backup from any source, Druva performs a full backup. The subsequent backups are incremental backups.

Step 4

Enterprise Workloads agent performs a full scan of the files and folders on the NAS share.

Step 5

NAS proxy sends the scanned files and folders for backup to Druva Cloud.


  • If Druva is unable to back up  locked files at the first attempt, it checks if the files are unlocked at the end of the backup. If the files are unlocked, they are backed up in the same backup cycle.  Locked files are not backed up.
  • Druva supports valid UTF-8 encoded file names, filepaths, and share names. Files with filenames encoded in a format other than UTF-8 are skipped from backups.  You can find a list of all the skipped files  in 
    • Phoenix-<job_id>-MissedFiles.log file at the  /var/log/Phoenix/NAS/backup/<backupset_id> location (for agent version prior to 7.0.0)
    • Phoenix-<job_id>-MissedFiles.log file at  the  /var/log/Druva/EnterpriseWorkloads/nas/backup/<backupset_id> location (for agent version 7.0.0 and later)
Step 6 NAS proxy transfers the deduplicated backup data to the Druva Cloud.