If you haven't actually converted the data from Plus yet and you have FixIT, that utility also has a file compression component.

Generally you would
<> Ensure that you have a good backup of the system
<> Run the Data Integrity Checks. Hopefully clean, but at least establish a baseline
<> Print and clear all Posting Journals/Audit Lists
<> Print and clear all other reports that allow this
<> Backup & DICs
<> Purge all unwanted historical data from the various modules
<> Backup & DICs
<> Delete any master file records that that you nor the system no longer needs
<> Backup and DICs
<> Run the File Compression utilities like DataCare / FixIT
<> Backup and DICs

Note that Print above does not necessarily mean to paper, you might want or need to print to a file rather than paper. If printing to file you might want to save these files somewhere other than your "live" ACCPAC Plus/Adagio Data folder.

Good Luck !!!