Need to Upload Entire Collection of Photos to Storage Site

Hi,

My photos are all on my hard drive and backup drive. I was advised to upload all of them to an online site in case of computer hard drive crashing, theft, fire, etc.

I probably have 10,000 photos saved.

What sites do you recommend? Should I upload photos in their full size? Is this feasible?

Do sites charge for so many photos?

Which sites are best?

Thank you.