Basic OS knowledge loss
A company may need to train new IT staff on an ‘old’ operating system after the person who knew it retires: HP3000 backup and SLT/CSLT creation, HP9000 backup and Ignite tape/image creation, changing IP addresses, DNS and email, user and password management, printer administration, and hundreds of other items needed to keep the system running smoothly.
Changing security concerns
A company may be obligated to maintain security standards across all IT infrastructure including archive systems. Even when not in production, archive data may still fall under regulatory requirements — non-encrypted communications such as Telnet, NS/VT and FTP are common examples. Password rotation, disabling unused users, additional hardware or software for compliance and secure disposal of disk drives all need support.