When a backup job fails with the errors “Failed to open storage for read/write access” or “File does not exist,” it typically indicates that Veeam was unable to access or write to the backup repository. These issues are often caused by connectivity problems, permission misconfigurations, insufficient storage, or file locks that prevent normal access. Common Causes and Resolutions Cause 1: Repository or Storage Connectivity Issues If Veeam cannot reach or communicate properly with the repository, it will fail to open the backup file for read/write operations. Resolutions: Cause 2: Insufficient Free Space When the repository runs out of space, Veeam cannot write incremental or full backup data, often producing the same error message. Resolutions: Cause 3: Permissions or Ownership Issues If the credentials Veeam uses do not have sufficient rights on the repository, the job may fail to open or write to the storage file. Resolution: Cause 4: File Locks or Interference from Other Software Antivirus, backup agents, or volume snapshot tools may lock Veeam backup files (.vbk, .vib, .vrb), preventing read/write operations. Resolutions: Advanced Troubleshooting If the above resolutions do not resolve the issue: Preventive Recommendations If you continue to experience errors after performing these steps, please contact Support@Managecast.com for assistance.