macOS 27 threatens to bury Time Capsule, FOSS brings a shovel
Briefly

macOS 27 threatens to bury Time Capsule, FOSS brings a shovel
"The next major release of macOS looks likely to remove Apple Filing Protocol (AFP) support, stopping Time Capsules from working... but life FOSS, uh, finds a way. The current version of macOS "Tahoe" 26.4 already has network Time Machine issues, especially for folks using Apple Time Capsules. It looks like macOS 27 may completely remove the network protocol they need. However, the Time Capsules run NetBSD under the hood, and that means that the FOSS world has been able to come up with a workaround."
"Although Cupertino hasn't told the world much about it yet, it is warning sysadmins to " prepare your network environment for stricter security requirements." Reading the bulletin, we found it rather clixby: while it firmly warns that security checks will become stricter, it doesn't spell out what products will change or how. Happily, there are elder Mac gurus out there who interpret Apple's sometimes Delphic utterances, and Howard Oakley is one of the greatest."
"In a post about networking changes coming in macOS 27, he translates that it will require TLS 1.2 or above. However, he also warns that it could mean the end of AFP, which is basically Appletalk-over-TCP/IP version 3.4. AppleTalk was the Mac network protocol for file sharing from System 6 onward. In 2013, OS X 10.9 "Mavericks" made Microsoft's SMB the default file-sharing protocol in place of AFP, and it looks like AFP now faces the ax."
"It's called TimeCapsuleSMB, and it aims to keep older Time Capsules usable with modern macOS. The Time Capsules run NetBSD under the hood, and that means that the FOSS world has been able to come up with a workaround. To be fair, macOS 26 Macs started displaying a warning to Time Capsule users nearly a year ago."
macOS 27 is expected to remove Apple Filing Protocol (AFP) support, which would stop network Time Machine backups from working with Apple Time Capsules. macOS 26.4 already has network Time Machine issues for Time Capsule users. Apple warns sysadmins to prepare for stricter security requirements, which are interpreted as requiring TLS 1.2 or higher. AFP has been deprecated and is tied to AppleTalk-over-TCP/IP. Time Capsules run NetBSD, enabling a FOSS workaround called TimeCapsuleSMB. TimeCapsuleSMB aims to keep older Time Capsules usable by providing compatible SMB-based connectivity for modern macOS systems.
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