Hi, >The only possible way is to add the information (the DataStore does not >have like the identifier/content of the previous version) to the stream >(addRecord) from the application side.
I suggest to read http://en.wikipedia.org/wiki/Data_deduplication - specially "Depending on the type of deduplication, redundant files may be reduced, or even portions of files or other data that are similar can also be removed." and http://en.wikipedia.org/wiki/Rsync#Algorithm Regards, Thomas
