is similar but in the reverse direction at step 300 the data backup operation or restore is started on the lan free client 100 at step 310 the client sends data to lan san api via virtual ethernet client adapter 101 at step 320 the client ethernet adapter transmits data through virtual lan 180 at step 330 the virtual lan transmits data to virtual ethernet client adapter 121 at step 340 the virtual ethernet client adapter transmits data to lan free storage agent 122 at step 350 the lan san api sends data to tape library via san physical interfaces 184 at step 360 the san connection transmits data to tape library san connection of tape library 190 at step 370 the data is written on tape library 160 until the end of the backup at step 380 if the data backup is not finished the process returns to step 310 fig4 shows the workflow of the backup restore protocol information transfer during a backup or a restore of the data the workflow shown on fig4 describes the process of backup protocol information exchange between the client partition 100 and the backup server 140 to manage the backup or restore of the data of the client partition 100 at step 400 the data backup or restore.