... floppy disks are available in several proprietary formats, providingstorage capacities up to a gigabyte or more. They are most useful for manual databackup and transport. Data can be accessed more ... device. They are most useful for small-scale distribution of large amountsof data. Some can only be recorded once, unlike magnetic disks, and are not as practical for day -to- day data backup, although ... past fewyears. Most of them are designed for backup of the hard-drive data, or for trans-porting large amounts of data. Tape backup systems are available up to severalgigabytes in size, and...