This error occurs when the Volume Shadow Copy Service (VSS) is unable to run due to another snapshot management provider being installed on the system.
The error's known causes and resolutions are described below.
Many backup solutions have their own proprietary snapshot manager which can cause conflicts with other backup solutions installed on the system.
If you have (or had) more than one backup program installed on your system, disable/uninstall all of the programs except for BackupAssist, and run the backup job again.
It is best practice to only have one backup solution installed at any one time.
You should also run a registry cleaner after the other backup solutions have been uninstalled: http://www.backupassist.com/blog/support/how-to-resolve-a-ba910-volume-shadow-copy-error-0x80004230/.
VSS requires space allocated to each volume to be able to create and store snapshots. The steps to configure shadow copies varies between operating systems, so it’s advised to check Microsoft’s knowledgebase for the steps specific for your OS. The steps and commands to alter the shadowstorage on any given volume are uniform across operating systems.
The shadow storage size can be checked and manually changed through command prompt.
This will resize the limit to XX percentage size for the X: drive.
We generally recommend 30% for shadowstorage size to be able to avoid most errors related to Shadow Storage.
Having two backup jobs running at the same time within BackupAssist can cause this error to occur if both backup jobs are trying to run VSS.
Ensure that only one backup job is running at any one time.
If your destination drive is not formatted in NTFS, this can cause a conflict with the snapshot process which causes this error.
Make sure the backup destination is compatible with the NTFS format. Please view the following article on how to convert a drive to NTFS format: http://support.microsoft.com/kb/307881
High disk activity during the snapshot process can cause a conflict with the snapshot creation as it can cause the snapshot manager to have trouble determining a cutoff point for the snapshot.
To resolve this, it is recommended that you re-schedule your backup for a time where there is less disk usage.
It is also recommended that you perform consistency checks (such as chkdsk) on the drive(s) which are in the backup set.
BA904 Volume Shadow Copy Error 0x80042306 - provider veto