I have a couple clients who are interested in local 10TB+ NAS, either DIY or synology. I am looking for a Mac and PC compatible client software that is easy enough for a user to keep running on their machine that will backup to that NAS. Does not necessarily have to have external drive or time machine support but that would be good. If the software dictates that I stay on Synology, that's fine, as long as its simple to use and a user could potentially onboard new machines to their local NAS.
The reason I want to use Synology or TrueNAS is because I have experience backing both of those up to Backblaze B2 or AWS storage for redundant off site backup of the NAS. Also many of the users have


