Can I trust Xero and what else should I consider?

I'm back looking at the accounting software solution question for a bunch of small companies.

Requirements are -

Online - if cloud base (v's hosted internally by us), must be across more than one DC in more than one location with more than one provider (ie I wish to avoid Amazon taking nodes off line in error and taking out our entire accounting system simply because the system was only across one provider in one location pool.)

PC based

Bank Reconciliation

Customer Invoicing

Smart GST

Job/ Project Tracking

Flexible Recurring Transactions / Invoices

Stock Management & Contract Pricing

Purchase orders

Users with different access (eg can access PO but not invoicing etc)

Multi currency - eg can link with Paypal downloads and reconcile our US accounts

Local back up - ie must be able to extract a human readable (so XML is fine) back up file as often as we like.

Affordable Price - SAAS is fine with monthly billing (seems most common today

Rod, I suspect Xero meets these requirements, however I read about the whole Amozon thing (well I think it was AWS), but I never read anything about what you did about this. I did just this past week read about how you're selling a big lump of shares in your company and read people raise questions of confidence about why this has happened. I do understand that it's very common to sell down shares so you can start up the next thing, so I have no issue with that point, but I do have issue with the AWS issue. Normally I wouldn't even bother raise this, I'd just ignore Xero as an option, however more and more and more of my 'friends' on line are now using your solution, and while I try not to use Microsoft all the time, there is no denying that Windows is fairly good software (if you can make the implied connections). Comment from you or your team (more likely) is welcome, though I'm not here to start a flame on this issue, I simply wish to share my reservation.