The Cloud: in some instances just one Pentium pizza box sitting in a garage with a really old UPS. That's what you need to consider when picking a data storage or a data backup partner.
There are so many backup solutions available today: Mozy, SugarSync, and others. ARS reviews quite a few. Here's one more: Cloudberry backs up to Amazon S3. Are you offering any or Are you late to backup?
The WHIR is having a webinar on How to Profit from Selling Hosted Cloud Services – Exchange, SharePoint, AS/AV & BlackBerry.
Another one: Backblaze. "Your data is backed up online to our data centers, so nothing can touch it. Restore from the web or get a DVD or USB drive sent via FedEx."