By default, LinkFixer Advanced does not automatically create backups of files that are modified during processing. However, you can tell LinkFixer Advanced to create backups of files by going to the "hamburger" menu | Settings and selecting the “Backups” tab. Then you can check the “Create backups of modified files” checkbox option.
On the same screen, you can select the location where backup files will be created.
Note: It is always a recommended “best practice” to make a backup of your data prior to running any program that will move or modify your files. We strongly recommend that you make a backup file before running LinkFixer Advanced.