If you have enabled "Fast copy" in the AlbumSaver "Settings", it will slow down your computer and is recommended to let AlbumSaver run, uninterrupted. If you do not enable fast copy you are able to use your computer while AlbumSaver is backing up your pictures and videos.
Please make sure that your computer doesn't go to sleep while AlbumSaver is backing up your memories. It will pause the process. For instructions on how to turn off sleep mode for Mac, please see this article HERE.