This post provides useful methods.
Here is how to do that:
1.
First, you better locate the reparse point folder or its subfolder.
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To do that, click theStartmenu > typecmdin it > right-nudge the result to chooseRun as administrator.
Typedir /al /sand press theEnterkey.
The list of JUNCTIONs will be displayed.

Press theWindows+Ekeys together to openFile Explorer.
Locate the reparse point you found, right-pick the reparse point icon, and clickDelete.
Then, you could execute the backup task again and peek if the issue has been resolved.
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ou may receive the the tag present in the reparse point buffer is invalid fault signal in Onedrive.
This post tells you how to get rid of the issue.
Fix 2: Shrink the Volume
1.

Press theWindows+Rkeys together to open theRundialogue box.
Right-smack the partition you oughta shrink and chooseShrink Volume….
3.
Thus, its suggested to use a shorter backup path when backing up to a web connection share.

Then, right-tap the disk and select theFormat…option.
In the Format window, selectNTFSfile system,512 allocation unit.
Then, check thePerform a quick formatoption, and clickOK.

It is a piece of professionalServer backup software.
It allows you toback up files,back up systems,move Windows to another drive, etc.
Now, download and install MiniTool ShadowMaker.

MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
1.
LaunchMiniTool ShadowMakerand clickKeep Trialto continue.
Go to theBackuppage after you enter its main interface.
Then click theSOURCEmodule to choose the backup source.
ChooseFolders and Filesand choose the files you want to back up.
Click theDESTINATIONmodule to continue.
MiniTool ShadowMaker provides four destination paths to be chosen.
Here, you should probably click theSharedtab.
ClickBack Up NoworBack Up Laterto start the backup task now or later.
NAS devices enable many computers to share the same backup server at one time.
Bottom Line
Thats all for how to fix the Windows Server Backup incorrect function issue.