Cloud backup with specific requirements

First of all, I'm aware of threads like Comparison of backup tools.

With that in mind, I have a specific set of requirements for backup, and I was wondering which are the current options - the informations around are fragmented and confusing, especially considering that online drives are not backup solutions.

My requirements are the following:

• be able to backup individual files (ie. no dejadup, thanks)
• cloud storage (upload of an intermediate backup archive is not viable)
• have a daemon running in the background, backing up at least at time intervals (optionally, having a continuous backup)
• no need to setup a server
• file versioning
• ability to handle large data sets (number of files rather than space)
• ability to backup drives that are not guaranteed to be mounted, without hassles

Optionally:

• restore from the backup structure of a given point in time. this is different from restoring from the current backup tree, with the option of choosing older versions.
• reporting

Price doesn't matter.

Excluded solutions:

• JungleDisk was perfect, until the moment it's been discontinued.
• SpiderOak is really badly coded; It has annoying bugs, and it hangs on large number of files. Also, if a drive is not mounted when SO starts, it won't be backed up.
• Symform has a bug in the registration. Since you can't contact support without registering, it's completely useless.