Auto SEO automatically generates SEO keywords from names of products, categories, manufacturers and information. You can choose one or more from these options at once. Keywords can be reset - existing keywords will be overwritten, or added only - existing keywords will be preserved. Any others keywords in table will be preserved. Backup file is created every time you generate keywords (only one, previous backup file will be overwritten) - you can find it in system/cache/auto_seo/backup.csv and use it to restore previous keywords if you need to.