San Diego, California systems integrator Zzyzx Workstation Peripherals Inc is offering what it calls a file system shadowing product that periodically takes shots of a Sparc workstation’s file system, enabling users to return to a previous version of a file for reading or writing. ZShadow captures files as differences between versions only. It can be used in conjunction with RAID arrays and tape back-ups. Any number of watchpoints can be maintained, transparently recording differences in files and saving them on to a partitioned section of a hard drive. Zzyzx says 100Mb is sufficient for average system usage. Up on SunOS and Solaris now; HP-UX, AIX and Windows NT in 1995, desktop versions are $700; server software costs $1,200.
