The Code42 app assumes that what you're working on now is most important so prioritizes your most recently changed files and backs them up first. The default setting is to back up new information every 15 minutes. This offers great protection and allows you to easily revert to a previous version of a file.
However, frequently backing up new work delays the Code42 app's opportunity for initial backup of old files.
To promote backup of old files, reduce the frequency for new versions of new files. This trade off can be beneficial until your backup is complete.