我把代码修改成这样：

Sub BUandSave2()
'Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
'Saves the current file to a backup folder and the default folder
'Note that any backup is overwritten
Dim MyDate
MyDate = Date    ' MyDate contains the current system date.
Dim MyTime
MyTime = Time    ' Return current system time.
Dim TestStr As String
TestStr = Format(MyTime, "hh.mm.ss")
Dim Test1Str As String
Test1Str = Format(MyDate, "DD-MM-YYYY")

Application.DisplayAlerts = False
'
Application.Run ("SaveFile")
'
ActiveWorkbook.SaveCopyAs Filename:="T:\TEC_SERV\Backup Test\" & Test1Str & " " & TestStr & " " & ActiveWorkbook.Name
ActiveWorkbook.Save
Application.DisplayAlerts = True
End Sub

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它现在工作得很好。大学网络上一定有什么东西阻止了原件的运行。我在家里没有遇到任何问题。

我尝试了你写的代码，我发现代码工作，但当我打开备份文件，我得到了相同的错误，你得到.
所以我想你一定是在收到错误时打开了备份文件。
我写了一段代码来帮助解决这个错误：

If ActiveWorkbook.Path = "D:\MOVIES\excel test\Backup" Then
    Exit Sub
Else
    Application.DisplayAlerts = False
    ActiveWorkbook.SaveCopyAs Filename:="D:\MOVIES\excel test\Backup\" & _
    ActiveWorkbook.Name
    ActiveWorkbook.Save
    Application.DisplayAlerts = True

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我不认为大学网络有什么问题。

只是为了完成joe和kishlaymshr的优秀代码的清晰度，谢谢！：

Sub AutoBackup()

    If ActiveWorkbook.Path = "F:\TEMP\" Then

        Exit Sub

    Else

        Dim MyDate
        MyDate = Date    ' MyDate contains the current system date.
        Dim MyTime
        MyTime = Time    ' Return current system time.
        Dim TestStr As String
        TestStr = Format(MyTime, "hh.mm.ss")
        Dim Test1Str As String
        Test1Str = Format(MyDate, "DD-MM-YYYY")
        Application.DisplayAlerts = False
        ActiveWorkbook.SaveCopyAs Filename:="F:\TEMP\" & _
           Test1Str & "-" & TestStr & "-" & ActiveWorkbook.Name
        ActiveWorkbook.Save
        Application.DisplayAlerts = True
    End If

End Sub

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