What is Google Docs' SLA?

Question

Hi all,

I am evaluating online storage and for me, that means either Amazon S3 or Google Docs.

Amazon very clearly posts there reliability and SLA: http://aws.amazon.com/s3/#protecting

Their rates are obviously higher than Google's, but it is really hard to compare without having an SLA. Does anyone know what Google's commitment is for reliability? Is it 99.99% for data, is there anyway to make that more durable?

I have to ask too, wouldn't google docs at least be inheritently more reliable than a hard drive?

Thanks,

Walter