+*** Data storage
+See: [[http://www2.svjatoslav.eu/gitbrowse/sixth-data/doc/index.html][Sixth data subproject]]
+
++ Relational databases:
+ + Transactional
+ + Indexable / Quickly searchable
+
++ Git (version control system)
+ + Versionable
+ + Branchable / mergeable.
+ + Transparent cansistency, checksumming and deduplication.
+ + (Git as a database:
+ https://www.kenneth-truyers.net/2016/10/13/git-nosql-database/ )