A method for managing network attached storage (NAS) assets includes obtaining, by a backup manager, a backup request for backing up the NAS assets, in response to the backup request: determining a number of streams available to be performed in parallel by a set of backup agents, assigning a pre-backup operation to a first stream of the streams to obtain a set of slices for a first NAS asset of the NAS assets, initiating a first slice distribution of the set of slices to the set of backup agents based on the number of streams, assigning a second pre-backup operation to a second stream of the streams to obtain a second set of slices for a second NAS asset of the NAS assets, and storing the set of slices and the second set of slices in a backup storage system.