1. A system for concurrently backing up data streams based on backup time duration estimates, the system comprising: a processor-based application executed on a computer and configured to: identify a plurality of data streams scheduled for backup, each data stream corresponding to a different database, each data stream being received over a network; determine backup time duration estimates corresponding to each of the plurality of data streams, the backup time duration estimates being based on corresponding normalized historical backup time durations of the plurality of data streams, data transfer rates associated with each of the plurality of data streams, and the size of each of the plurality of data streams; create a ranked relational sequence based on the plurality of backup time duration estimates; and concurrently back up the plurality of data streams based on a concurrency limit and the ranked relational sequence.