It depends upon how you want to back it up. If you want to back it up to a
text file you can use I/O methods (Open #1 For Write) etc. You can also
write the date to another table using SQL (INSERT INTO tblWhatever Values
....) Or the AddNew Method:
Dim db As DAO.Database
Dim rst As DAO.Recordset
rst = db.OpenRecordset ("tblWhatever")
rst.AddNew
fld1 = Me.txt1
fld2 = Me.txt2
'... etc.
rst.Update