I\'m looking for a reliable backup solution on Windows, something with a feature

Question

I'm looking for a reliable backup solution on Windows, something with a feature set similar to Yadis.
I've been using CrashPlan for 2 months, but their software lost more than 1TB of my data, that's why I'm looking for alternatives.
Requirements:

Real-time local folder-to-folder backup
I don't need online features, I want to use this to duplicate my files between my local disks.
Versioning support
Should be able to choose how many versions to keep of the files.
Or at the very least, it should keep deleted files until a specified time or space limit gets hit, and delete them afterwards automatically.
Plain backup
I want to be able to open the backup without special software. No proprietary file formats.
Shadow copy
Backup every file, even locked/system files. (Yadis fails this one)
AutoStart
Doesn't need to run as a service, but that's a plus.
Actively maintained
I don't want to use discontinued products.
Relatively cheap
Should be under $100 for one-time payment, or $60 for a yearly fee.

Optional requirements:

External disk support
Shouldn't have any problem using external disks, at least on the source side.
Low resource usage
I'm not really comfortable with something that eats 1GB of my RAM.
Compression support
Preferably ZIP, but I'm not picky about this. Any ordinary everyday format is acceptable.
Freeware or Open Source
Linux support
Cloud storage

Explanation / Answer

It sounds like what you really need is to modify your storage to use a RAID system - if it is configured above RAID 0 then a failed drive is not a problem and results in no data lost.

It also sounds like you would like a versioning file system - several operating systems offer this but AFAIK none from Microsoft. Wikipedia lists several experimental versioning file systems for Linux such as:

ext3cow
NILFS
Tux3
Next3

You could also take a look at WebDAV possibly combined with Subversion Autoversioning.

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