Flickr is an free (and paid) commercial online photo album. You can upload photos to Flickr and they offer 1TB generous storage even for the free account.

flickr-account-1tb
You can download the Flickr Uploader which allows automatic backup your photos/pictures (at specified folders) to Flickr.

flickr-uploader2

flickr-uploader
Everytime there is a new photo/picture added to the folder, the Flickr Uploader will upload it to Flickr (and don’t worry, they are private by default unless you share them).

flickr uploader icon
Update: I don’t use Flickr Anymore and it seems they have ended the Flickr 1 TB storage for Free Users on April 20, 2018. Flickr is now specifically for Photography users.
If you are looking for backup photos, you can use: Store and Backup Unlimited Photos using Amazon Photos (Prime), alternatively, here are some other options: Personal Cloud Options to Backup Data and Photos
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