C# vb.net +SqLite 备份数据库和还原数据的问题

请问怎么用代码备份，我的代码是这个能帮我看看哪里错吗？还有File.io.copy方法怎么备份和还原
Dim conn As New SQLiteConnection
Dim con1 As String = "'" & Application.StartupPath & "'\data\data1.db3"
conn = New SQLiteConnection(con1)
Dim cmd As New SQLiteCommand(conn)
Dim str = "backup database test to disk='D:\' with format"
cmd = New SQLiteCommand(str, conn)
conn.Open()
cmd.ExecuteNonQuery()
MsgBox("备份成功")
conn.Close()

可以使用System.IO.File.Copy或者System.IO.FileInfo.CopyTo方法均可以实现目的

sqlite没用过，不过初始化da是new ****dataadapter(查询语句，conn)这样初始化吧