Appending ONLY new records to a table

I have a database that uses forms to update records in a table. I would like
to preserve historical data, so that the updated record shows up in the form,
but the former (historical) record is still in a table. I believe that an
append query is the best way to do this, but I have had endless problems
getting it to append ONLY the updated records. Each time I update a record,
it tries to append all 216 records, even though only one record has changed.
I have tried assigning the query to an afterupdate event procedure, but it
still tries to append all 216 records, instead of just the updated record. I
have also tried putting both the sourse and recieving tables into the query
and assigning a relationship that specifies all records from the source table
and only those records from the recieving where the records are equal. I
have also tried the reverse of the aforementioned statement. I am using the
following Tables:
Source Table: Nurse
Fields:

Nurse ID(primary key)
LEA
Term
Type
Name
Education
Hire Date
Certification
Salary
License Recieved
License Expiration Date
Date License Recieved

Nurse Hiring History Table(where I want the records appended)

Will have the exact same fields as listed above.

I do not want to have to view a counties entire hiring history in order to
view the current data in the form which updates the source table, but I need
a way of preserving the former employees information automatically when the
form is updated. Again, I do not want to view the old data on a daily basis,
I just need it to be saved in a table for later query, without requiring much
effort on the part of data entry personnel.