EXT4 supports the same timestamps and precision as NTFS does, but their metadata and ACL structures are completely different. If you want to preserve NTFS metadata and ACLs on an EXT4 filesystem, you're going to need a container format that supports these things. You also must "push" the data from Windows rather than "pulling" it from the backup server.
Fortunately, there are a number of container formats available that can do this. Microsoft's own VHD format is probably your best bet. They're not just for virtual machines. Windows allows you to mount VHDs as a drive letter natively in Disk Manager. You can then use TeraCopy/RichCopy/FastCopy, etc to copy the files to it.
Additionally, Microsoft's WIM format also supports NTFS metadata and permissions, and you can also mount a WIM file. The drawback to WIM is that you must unmount /commit changes when you're done and it's horribly slow. On the upside, however, the tool for managing WIM files (DISM) is built-in to Windows and preserves metadata and ACLs by default. If you boot Windows offline (to a Windows PE environment), you can clone the entire OS to a WIM, no 3rd party tools required.
There are also 3rd party options available too. WinRAR is capable of backing this information up and is free (but not open source). There's also Acronis TrueImage, which is commercial backup software, but supports all NTFS features.
Really, you have a lot of options here, but EXT4 and Linux alone are not enough to support the NTFS data structures you're trying to preserve.