Backup preprocessing files

When Handy Backup 2.1 is performing a backup on a backup archive that already exists (I have the backup set to only refresh existing files and add new files) it seems to take a long time preprocessing files. Why is this?

Note that when a large backup is being updated, the folders and files to be backed up need to be preprocessed, then the existing archive needs to be read to compare the old files with the new ones. This can take some time on large backups when performing an incremental backup operation.

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