The Differential Synchronization alghoritm does not instruct anyhow how the data should be stored.
Considering the alghoritm requires the server to store:
a) backup shadows (associated with a given client and server version document version)
b) shadows (associated with both, client and server version)
and versions are specific to client-server channel,
the alghoritm is by default in its design very memory inefficient.
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As a solution one may store backup (and potentially shadow) documents and share them between several clients as suggested in:
http://lists . jboss.org/pipermail/aerogear-dev/2014-September/009026.html
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