What is the purpose of enabling Shadow Copies snapshot twice daily when I cannot restore files from Previous Versions ?

The reason I ask is because it cause my Backup Exec 2012 to failed randomly. I've tried to backup the same files using Windows Backup and it is also failed.

where is that option is configured ?

Well I'm not sure why it is on like that.

The drive are LUNs presented from array to hold VM backup files which is quite large 20 - 450 GB files and some files grow up to 2 TB.

So I don't know why this setting was left on by my predecessor in my backup server LUN

ok, It seems that it is not required to restore the 3rd party backup files which is quite large (20 - 450 GB files) using the "Previous Versions".

So if I turned off the schedule (remove) and then reboot the server, is that all that I need to do ?

or do I have to cleanup or is there anything that I may need to pay attention to ?

My goal is to disable or turn off the Shadow Copies completely here, but somehow I cannot do it from either my user account or DOMAIN\Administrator.

The screenshot below shows the error after I've deleted the two default schedule of VSS and reboot the server

Upon checking on the Scheduled task, somehow there are some job that is automatically created and logged by NT AUTHORITY\System for each of the drives, see below:

how to remove and stop the VSS snapshot completely ?
My backup software is now failing to backup the files to the tape drive.

Yes that's seems to be the case, but how to completely stop it ?

The backup is failing with backup exec and windows backup.

the problem still exist, even when the scheduled tasks are all disabled.

Here's the event logged:

Log Name:      Microsoft-Windows-TaskScheduler/Operational
Source:        Microsoft-Windows-TaskScheduler
Date:          21/04/2015 12:53:44 PM
Event ID:      140
Task Category: Task registration updated
Level:         Information
Keywords:      
User:          SYSTEM
Computer:      BKPSRV01.domain.com
Description:
User "NT AUTHORITY\System"  updated Task Scheduler task "\ShadowCopyVolume{43593b05-ce56-4853-b03b-1b9d15d6d7c9}"

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Log Name:      Microsoft-Windows-TaskScheduler/Operational
Source:        Microsoft-Windows-TaskScheduler
Date:          21/04/2015 12:53:40 PM
Event ID:      140
Task Category: Task registration updated
Level:         Information
Keywords:      
User:          SYSTEM
Computer:      BKPSRV01.domain.com
Description:
User "DOMAIN\Administrator"  updated Task Scheduler task "\ShadowCopyVolume{43593b05-ce56-4853-b03b-1b9d15d6d7c9}"

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Log Name:      Microsoft-Windows-TaskScheduler/Operational
Source:        Microsoft-Windows-TaskScheduler
Date:          21/04/2015 12:53:40 PM
Event ID:      106
Task Category: Task registered
Level:         Information
Keywords:      
User:          SYSTEM
Computer:      BKPSRV01.domain.com
Description:
User "DOMAIN\Administrator"  registered Task Scheduler task "\ShadowCopyVolume{43593b05-ce56-4853-b03b-1b9d15d6d7c9}"

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and this is the error popped up when clicking on the drive Shadow Copy service:

---------------------------
Shadow Copies
---------------------------
Failed to create a default schedule for creating shadow copies of volume E:\.
Error 0x80070050: The file exists.
---------------------------
OK   
---------------------------

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Hi Andy,

The article points to this KB article https://support.microsoft.com/en-au/kb/926959 from Microsoft regarding SharePoint.

In my case here I do not have SharePoint in the problem server.