Cloud storage and sharing, is it secure?

Hi,
     What is the best and most secure cloud data storing and sharing

provider? My mom has been placed in a nursing home and will be under

hospice care. We find that all siblings at one time or another need

to access her personal data. We would like it in the cloud so

info/documents can be placed here. Too often the person with the

specific info needed at a given moment isn't available. What is the

most dependable and secure site? We are talking about Social Security

number, financial info, health insurance data, bills paid, etc. Or is

it better to keep info transmitted by e-mail and each of us set up a

folder on our respective e-mail accounts?


Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
www.cnet.com/forums/discussions/cloud-storage-and-sharing-is-it-secure-585123/


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