A computer-implemented method of managing data storage according to collaborative activity can include determining collaborative activity for each of a plurality of data items associated with a first user and stored within a first data storage device. The method can include calculating a measure of relevancy for each of the plurality of data items according to the collaborative activity and comparing the measure of relevancy of each of the plurality of data items to at least one relevancy threshold. Different ones of the plurality of data items can be selectively migrated from the first data storage device to a second data storage device according to the comparison of the measure of relevancy of each of the plurality of data items.