1. The plugin DOES NOT create backups. Please create a backup manually or install the free WP Reset plugin which has snapshots that wlll enable you to undo a reset. If something is not clear open a ticket on the official support forum. All tickets are answered within a few hours.

2.
Fatal error: Uncaught Error: Call to undefined function _e() in /home/cezarypiatek1990/public_html/testwordpressa/wp-content/plugins/wordpress-database-reset/views/partials/select-tables.php:5 Stack trace: #0 {main} thrown in /home/cezarypiatek1990/public_html/testwordpressa/wp-content/plugins/wordpress-database-reset/views/partials/select-tables.php on line 5