![]() ![]() This is really where the magic sauce that makes TM so useful to most users comes from. The real magic of Time Machine however, is the simplicity of its UI to recover whatever incremental date you want, and to be able to use spotlight to search back in time for your files. The Mac OS has long used aliases as a way to create a soft link stand-in for another file or directory. Hard links differ from "soft links" (also known as symbolic links), which simply act as placeholders pointing to another file. The new change is referred to multi-links, which are similar to "hard links" common to Unix users and potentially available when using NTFS on Windows. To solve both problems, Time Machine does something new and different that actually required Apple to make changes to the underlying Mac file system, HFS+. This is done hourly for the past 24 hours, daily backups for the past month, and weekly backups for everything older than a month. OS X using an events driven agent, fsevents, to track which files change (no need for scanning every hour), and then, using modified hard-links, called multi-links for files which don't change, only those that do are incrementally changed. ![]()
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