Time Machine support is also dropping support over SMB1 so whatever new solution needs to support SMB2/3.
SMB2 came out with Vista and SMB3 was Win8 so they are not new protocols either.
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Where "new" in this case could be a NAS running Samba from 2011? Samba added official support for Time Machine much later, but I think it was possible on earlier versions with some extra steps.
Samba 4.8 from 2018:
* https://www.samba.org/samba/history/samba-4.8.0.html ("vfs_fruit")
* https://wiki.samba.org/index.php/Configure_Samba_to_Work_Bet...
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I've added support for Samba 4 (running SMB3) to the Time Capsule so it can work with modern macOS:
https://github.com/jamesyc/TimeCapsuleSMB
SMB1 has major security issues but even those ignored (which a lot of people on private home networks shouldn't be too worried about) it's also slow as hell on MacOS
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