Apple Workgroup Server 9150/120 - Manual (Page 75)

You need to read this chapter only if your server includes an internal tape-
backup unit.
The internal 3.5-inch DDS-2 DAT drive and accompanying software can perform
full or partial backup and restore procedures for all of the data on your hard
disks. In addition, the drive automatically performs error correction and data
compression of the files that you back up and restore. The error-correction feature
helps ensure a high level of data integrity. The data-compression feature allows
more data to fit on a cassette than do conventional backup mechanisms.
Use Retrospect Remote (or some other backup utility) to back up and restore
data. For information, see the utility’s documentation.
5
Using a DAT Drive and Tape Cassettes