Does Argentum Backup back up only new and changed files or does it process all files each time it updates the existing backup?
Argentum Backup always processes only new and changed files and folders, that is the files and folders that have changed since the time of the most recent backup. This is true for both backup operation modes: Zip compression mode and native file copying mode. However, in Zip compression mode, in order to update any single file in the Zip backup file, the entire Zip backup file has to be recreated. See the detailed explanation below.
