Rackspace:
"Up to 8 checks free from Rackspace Cloud Monitoring, for 24x7x365 monitoring of URL content, port, and ping" [1]
"File-level backups. No charge per-server. File storage: $0.10/GB/month. Bandwidth: $0.18/GB/month." [2]
[1] http://www.rackspace.com/cloud/managed_cloud/support_a/ [2] http://www.rackspace.com/cloud/support/