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+# Handling digital media masters
+
+Master files -
+either original sources or as close as possible -
+are precious and should be carefully tracked.
+
+Digital media files -
+e.g. photos, videos, music -
+are often large and binary encoded,
+which poses special challenges for their tracking.
+
+
+## Git-annex
+
+Digital media masters are tracked with git and git-annex.
+
+Git is a version control system -
+a repository for historic versions of file contents of a folder.
+Git-annex is an extension to git,
+better at handling large files.
+
+Conceptually,
+git-annex tracks changes to data same as git,
+but where git tracks the *contents* of files,
+git-annex instead tracks file *checksums* into git,
+moving aside the actual data (to an "annex")
+and tracks which annex currently holds data with which checksums.
+
+
+## References
+
+* [media-master][Source of this document]
+
+[media-master]: <https://source.redpill.dk/media-master>.
+  "Digital media master material"