EMC Retrospect for Macintosh Clients Upgrade 50 Clients License Only, Backup / Recovery, Upgrade, 50 license(s), English, PowerPC, 128 MB EMC Retrospect for Macintosh Clients Upgrade 50 Clients License Only. Type: Backup / Recovery, Software type: Upgrade, License quantity: 50 license(s). Minimum processor: PowerPC, Minimum RAM: 128 MB, Minimum storage drive space: 500 MB. Platform: MAC