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Is Volume Shadow Copy requester required in order for Cobian backup 11 run successfuly

Posted on 2016-10-20
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Last Modified: 2016-10-27
We have Cobian backup 11 and noticed halfway of the process a message saying: "Couldn't contact the Volume Shadow Copy requester. Please check that the service is installed and running".  We understand that the shadow copy is for use if a file being backed up is in use.

However, we run this apps when no user is in the PC and always make sure all apps  are closed.

Is Volume Shadow Copy requester required?
Can we backup successfully without it?
If so, how do we disable  this so the message doesn't keep showing?
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Question by:rayluvs
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Assisted Solution

by:John Tsioumpris
John Tsioumpris earned 200 total points
ID: 41852350
You go from the UI to Options -> general ->Service and Application Control --> Service....Stop if it is running and then uninstall Volume Shadow Copy requester
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by:rindi
ID: 41852461
It depends what you are backing up. If it is just data files and no one is using those files it shouldn't have to run. But if you are also backing up something else it may have to run.
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Author Comment

by:rayluvs
ID: 41852546
Just finished going thru yor steps and this is what it displayed as what is setup:

cbvr
Seems it's not installed.
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Author Comment

by:rayluvs
ID: 41852549
Just finish checking the task (see below)....

cvdb
Could it be we had it checked? (we just unchecked it)

please advice if this was the problem.
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by:rindi
ID: 41852603
I don't know what you are backing up. Is it the complete OS partition or just the data folders? Cobian isn't meant to backup system (OS) folders, but rather just for data. If you want to backup the whole system you are better off with an image type backup, for example what Paragon backup & Recovery does.
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Author Comment

by:rayluvs
ID: 41852627
It's data.
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by:rindi
ID: 41852643
Then some of that data may still be accessed by something, for example your AV scanning tool could be scanning files.
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Author Comment

by:rayluvs
ID: 41852700
Accessing the data while Volume Shadow Copy requester running?  But it seems off as displayed in ID 41852546.

So we can't turn it off as an EE recommended or uninstall it because it's already off.
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by:rindi
ID: 41852741
I wouldn't turn off Volume shadow copies. It is a part of Windows and should run. If it doesn't run properly, you should troubleshoot why it doesn't run.
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by:noxcho
ID: 41853384
Open a system information tool in Windows and check in Software Components which program or file is using this volume. See my attached example.
System-Information.jpg
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Author Comment

by:rayluvs
ID: 41853491
NO, wait.  We think you guys are thinking of  Windows Volume Snapshot Service, Volume Shadow Copy Service (VSS). Our problem is NOT VSS, the error message comes from Cobian Backup.  The message displays: "Couldn't contact the Volume Shadow Copy requester. Please check that the service is installed and running".  

We don't think the problem is the Windows Volume Shadow Copy Service (VSS), it's seems like Cobian has apps called 'Volume Shadow Copy requester' (see pix below seems Cobian hasn't installed it, same pix as in ID: 41852546 - notice in the right image, it's not installed):

cvs
For some reason Cobian Backup cannot contact or see or work with the it' Volume Shadow Copy requester.

So, going back to our original question,
  • Is Volume Shadow Copy requester required?
  • Can we backup successfully without it?
  • If so, how do we disable  this so the message doesn't keep showing?
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Assisted Solution

by:noxcho
noxcho earned 300 total points
ID: 41853606
So, going back to our original question,

Is Volume Shadow Copy requester required?
Yes. It is needed to take a snapshot of data bitmap on partition.

Can we backup successfully without it?
Remove the drive letter from this partition. It should then be able to backup it. If not then Cobian is a lame backup software which is not grown up enough to handle such tasks.

If so, how do we disable  this so the message doesn't keep showing?
It should be a setting of the software (Cobian in your case) which says - USE HOT PROCESSING TECHNOLOGY.
Hot Processing means - on the fly. Without rebooting the system in case some files are used.

But! If Cobian is programmed properly then it should check first if any file on the volume is locked by some process or accessed by some program. If yes - it says to VSS requester (own from Cobian or one from Windows) - take me a snapshot of data bitmap. In this stage the VSS takes snapshot (in other words a picture) and then gives it to Cobian. Which then uses it to save the data.
If to some reason the VSS service is not running, or is not installed or corrupt - then this operation will give error. Like in your case.

The opposite case is when the volume is not locked (no file is accessed from it) then well written backup software simply backups the partition. How to check that volume is not locked? Either unmount it (remove the drive letter and assign it again), or use the steps with system information to see what is accessing this volume. Then stop this access.
In this case Cobian should not initiate VSS Requester at all.
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Author Comment

by:rayluvs
ID: 41853625
Thanx!

One last question regarding our entry in ID: 41852549 (see pix below), if unchecked on the Task the option "use volume shadow copy", it's just that? Cobian will not rely on  Windows Volume Snapshot Service (Volume Shadow Copy Service - VSS)?

 vvv
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by:noxcho
ID: 41853709
Yep. It is exactly what I am referring to.
But if you uncheck this and there are files used on partition then the logic of the program will make the system restart.
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Author Comment

by:rayluvs
ID: 41854746
Scenario:

When Cobian backup is executed, the user always make sure that no software is running, like Word, Excel, Accounting software etc.  Also the user does this every night leaving it running when he leaves so we he gets in in the morning, its done.

(We know that there better apps for backups, but this users doesn't want anything else)

Based on this scenario, and the Cobian task option "use volume shadow copy" is unchecked, would the apps work with no problem?
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by:noxcho
ID: 41855502
I thought I have already answered this question. But inly the developers of Cobian can give complete answer. According to the logic of backup software (most of it) should work with VSS enabled. VSS is used exactly in cases when there are some apps of files in use. If nothing is used the vss feature is not needed.
In your case it does not work with vss. And I suspect it will not work with vss unchecked as well because it will claim that some files are used.
Have you tried reinstalling Cobian? This could repair the VSS.
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Author Comment

by:rayluvs
ID: 41855506
This is a new PC installed from scratch.
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Expert Comment

by:noxcho
ID: 41855536
Then it is bug in Cobian.
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Accepted Solution

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rayluvs earned 0 total points
ID: 41855729
Hi

We found what causes the message ""Couldn't contact the Volume Shadow Copy requester. Please check that the service is installed and running" - the option in the Cobian task "use volume shadow copy" was checked and was depending on the VSS.  We unchecked it and Cobian works excellent.

So to place an answer on the our questions so it can help other members:

Is Volume Shadow Copy requester required?

It's not required for Cobian to work successfully.  In our case the user runs Cobian Backup at night and it's a single non-network PC, so for his purpose, his Cobian doesn't need the option task checked.

Can we backup successfully without it?

Yes.  We tried it, unchecked the option and no message appeared and all the tasks file were backup with no error message.

If so, how do we disable  this so the message doesn't keep showing?

Just uncheck the task option "use volume shadow copy".
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Author Closing Comment

by:rayluvs
ID: 41861865
We chose our entry as best answer because by unchecking the option, the error stopped; se we want other members to benefit from it.
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