Back to My Mac was a feature introduced withMac OS X Leopard (10.5) that used Wide-AreaBonjour to securely discover services across the Internet and automatically configure ad hoc, on-demand, point-to-point encrypted connections between computers usingIPsec.
Due to its generality,Back to My Mac worked for manyBonjour-enabled services, not just Screen Sharing (similar toApple Remote Desktop) and File Sharing. It required a router that supports eitherUniversal Plug and Play (UPnP) orNAT Port Mapping Protocol (NAT-PMP). It used UDP port 4500 for point-to-point IPsec connections (which may be mapped to different UDP ports on the public side of a NAT router).[1][2]
For a time, Apple includedBack to My Mac in itsiCloud service rather than the previously usedMobileMe, thus making it free to use.[3]
On August 9, 2018, Apple updated a support document to note thatBack to My Mac would not be part of themacOS Mojave (10.14) release.[4] The support document was updated again on May 31, 2019, to indicate thatBack to My Mac services would be discontinued for all other versions of macOS as of July 1, 2019.[5]
Back to My Mac was used to edit and transfer files from one Mac to another. In one instance anApple Store employee used this technology to capture the image of a person who stole aMacBook, using the built iniSight webcam.[6]
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