For businesses challenged with rapidly growing data backup and long-term data retention needs and limited physical space for a tape library, the IBM TS3310 offers simple, rapid expansion as processing needs grow. This tape library allows you to start small, with only a single 5U high library. Over time, as your need for capacity expands, you can add additional 9U expansion modules, each of which contains space for additional cartridges, tape drives and a redundant power supply. The entire system grows vertically. Currently, available configurations include the 5U base library module and a 5U base, with up to four 9U expansion modules.