If  you have decent internet, backup to Google Photos.  It's free and unlimited storage.  Also it will work on all your devices.  

Staples has an 8TB external drive on sale for $109, today is the last day of the sale.

https://slickdeals.net/f/14350103-staples-20-off-100-online-code-logitech-advanced-illuminated-wireless-keyboard-80-ac-8tb-seagate-expansion-110-ac-apc-1000va-ups-90-ac-more?src=SiteSearchV2Algo1