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Why can't my MacOS High Sierra (10.13.1) detect NAS's time machine folder?
The time machine feature in NAS series is used AFP (Apple Filing Protocol), and MacOS's time machine can use this protocol to detect the folder and run backup. But MacOS High Sierra (10.13) was already changed the default system format to APFS (Apple File System), and the AFP is no longer possible to share file or detect NAS time machine folder, therefore, if the user uses MacOS High Sierra and would like to share file to NAS, the only way is using Samba or NFS.
Here is the information from Apple official release note: https://support.apple.com/en-us/HT207828
"AFP can’t share files on Apple File System (APFS). Apple File System (APFS) is the default file system in macOS High Sierra for Mac computers with all-flash storage. You can't opt out of the transition to APFS when you upgrade a Mac with all-flash storage to macOS High Sierra"
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