where the pay roll data is stored

Where The Payroll Data Is Stored 

Once the payroll is run, where does the data get stored and how can we retrieve the same at a later date?
Below is the info:

Payroll Clusters:
Cluster tables combine the data from several tables with identical (or almost identical) keys into one physical record on the database.
• Data is written to a database in compressed form.
• Retrieval of data is very fast if the primary key is known.
• Cluster tables are defined in the data dictionary as transparent tables.
• External programs can NOT interpret the data in a cluster table.
• Special language elements EXPORT TO DATABASE, IMPORT TO DATABASE and DELETE  FROM DATABASE are used to process data in the cluster tables.
PCL1 - Database for HR work area; (long text, etc)
PCL2 - Accounting Results (time, travel expense and payroll); (payroll results)
PCL3 - Applicant tracking data;
PCL4 - Documents, Payroll year-end Tax data (change logs, etc)
Data Management of PCLn
• The ABAP commands IMPORT and EXPORT are used for management of read/write to database tables PCLn.
• A unique key has to be used when reading data from or writing data to the PCLn.