Tandy 1000 MS-DOS Reference Manual page 57

BACKIJP
3.2
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Chapter 6 / Command Reference
External
BACKUP
[pathname]drive: [IS] [1M] [/A]
[lP] [lD:mm-dd-yy][lT:hh:mmx]
[/L:filename]
Backs up one or more files from a hard disk to a floppy disk.
Parameters
pathname is the path to the hard disk file you want to back up.
drive: the disk to receive the files.
/S produces a backup of subdirectories also.
/M backs up only those files that have been changed since the
last backup.
/A adds the specified files to those already on the backup floppy
disk. The existing files on the floppy diskette are not erased.
/P saves the file copies in a "packed" format that conserves
diskette space. It creates a subdirectory on the floppy diskette if
that is the only way to fill the floppy diskette. Warning: IBM'M
BACKUP/RESTORE compatibility can be lost if this switch is
used.
!D backs up only those files that were last modified at or after
the specified date.
/T backs up only those files that were last modified at or after
the specified time. hh can be 01-12. mm can be 00-59. x can be
a for a.m. or p for p.m.
/L creates a backup log entry in the file specified. If not speci-
fied, the file is given the name Backup.log, and is placed in the
root directory of the diskette. The first line of the file contains
the backup date and times. Each subsequent line contains the
filenames and the number of the floppy disk on which the files
are stored. This information is useful when restoring a particu-
lar file from a floppy diskette. By looking at Backup.log file, you
know which disk to specify for restore. On subsequent restore
operations, because Backup.log already exists, the current entry
is appended to the file.
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