For PGIM 5.1/2, how can I put older logs files back in the histevents/raw/'tag' directory from a backup directory?

Files are copied from the PGIM history to another PCD directory drive but we can only see the 1000 day trend,. We updated the placo.ini file to 3000 days but we want to restore the backup folder containing the ddmmyyy.00 fules to view/query past values before that date. I've read parts of the manual but it doesn't mention how to import the files back. Copying the files to the histevent/raw/tag directory doesn't make the older data visible when updating a trend on PGIM. Thanks for any help. I hope it is a script for 2600 tags we want to see the older values from the past.