From Appearance > Customize > Backup / Reset you can Download or Copy backup of current Theme Options or Import your old options backup

If you want to Import options that you downloaded before, you can inset codes in First Input and click on Import a Backup
If you want to Download or Copy current theme options Backup, Copy second input codes or click on Export and Download Backup
If you just want to Reset all the option without downloading backup, Then click on Reset All Options
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