Why not use the best tool for each platform? On Windows, Macrium Reflect is excellent (and free unless you want enterprise type features). It can image a bunch of partitions to a single backup, or do incrementals, or both. So you can say image the system once a week, maybe Sunday AM if people typically don't work weekends, and then a nightly incremental. If their computer fails (business PCs aren't exactly the pinnacle of reliability) fixing it is as easy as replacing their entire system and loading up their last image using a bootable recovery stick. It'll happily write to NAS. Having a complete tamper-proof restorable image lets you recover from ransomware, randomware (Windows becoming unbootable for example), garbageware (yeah sure, these Win7 drivers work just fine on Win10 - famous last words), Windows just barfing all over itself like a drunken sailor, or smoke and fire. Different systems, different needs...