Missing backup path

[ttrammell]

I would need someone who knows more about this to verify, but could 8dot3 names be causing this issue?

@uroni

ttrammell sent me some more info and the issue is probably caused by 8.3 names (DOS names). One course of action would be to mangle all 8.3 names on the server, the other to advise people to turn off 8.3 name generation.

Let’s go with the second first: See here for how to do this: Error 0x19 when NTFS file system creates name in 8.3 format - Windows Server | Microsoft Learn . It has performance benefits as well.

I’ll add that link to the manual as setup step. The problematic pair of file names also should be rare such that it is improbable that many other people have this kind of problem, if they have not turned off 8dot3 names.

I back up a file server that constantly has people deleting, adding, and editing files, and after turning off 8dot3 DOS names I have never had a problem since.

As far as I know, it’s a simple on/off switch for 8dot3 names; but I don’t know if C: will allow you turn off 8dot3.

fsutil 8dot3name set F: 1 (disable on selected volume)

or

fsutil 8dot3name set 1 (disable all)

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May not be useful for the original question, but it might be for your most recent one @hippy1970 .