I remember that in my old job, scheduling under Windows XP was not available in our network PC environment, so I figured out how to write code in vbScript that would log me off at the end of the day, and do the data base back up at that time. For consistency, you probably will want to schedule the daily back up if your company network allows scheduling.
Below is vbScript code, which I have just created and tested, that could be modified to back up two data base files. You would need to apply your own file names and paths to make it work. You could modify the code to store backed up files in folders Day1, Day2...Day30, based on what the day of the month is. I used the days of the week as folder names. Destination folders are created if they do not exist.
The extension of the file with this code must be "vbs", such as dbBackup.vbs
'VBScript code to back up specific data base files
Dim oFSO, sFile, oFolder, oFileCopy
Dim sOriginFolder, sDestinationFolder, sOriginFilePath, dayOfWeek
dbFiles = Array("db1.mdb","db2.mdb")
dayOfWeek = WeekDayname(WeekDay(Date))
sOriginFolder = "c:\Temp\SharedFolder\"
sDestinationFolder = "c:\Temp\" & dayOfWeek
Set oFSO = CreateObject("Scripting.FileSystemObject")
'create destination folder if it does not already exist
If Not oFSO.FolderExists(sDestinationFolder) Then
Set oFolder = oFSO.CreateFolder(sDestinationFolder)
For i = 0 To 1
If oFSO.FileExists(sOriginFolder & "\" & dbFiles(i)) Then
sOriginFilePath = sOriginFolder & "\" & dbFiles(i)
Set oFileCopy = oFSO.GetFile(sOriginFilePath)
oFileCopy.Copy (sDestinationFolder & "\" & dbFiles(i))
WScript.Echo "Copying : " & Chr(34) & sOriginFolder & dbFiles(i) & " to " & sDestinationFolder
WScript.Echo "Unable to locate this file: " & sOriginFolder & dbFiles(i) & "." _
& vbCrLf & "Evaluation is required."