I would recommend the NAS R-3 Enterprise. You will be able to perform local backup functions that offer backup tasks providing Backup levels of Full, Incremental and Differential for the data residing on the shares providing backup tasks for scheduled times of minutes / hours or weekly with time settings . Data replication can also be beneficial for the data this will replicate there shares locally or over the Internet with another NAS R-3 enterprise server as they grow. Snapshots offers the same task levels as the backup functions for intervals of minutes too hour increments or weekly time frames for greater flexibility.