2.6
General Commands:
BACK
UP
Type:
External
Syntax:
BACKUP
[d:][path][filename]
[d:][/S][/M][/A][/F:(size]
[/P][/D:date]
[/T:time]
[/L:[d:][path]filename]
Purpose:
Makes
a
backup
copy
of
one
or
more
files.
(In
DOS
Version
6,
this
program
is
stored
on
the
DOS
supplemental
disk.)
Discussion
The
first
path
and
filename(s)
you
enter
identify
the
disk
file(s)
to
be
backed
up.
The
second
drive
specified
is
the
drive
where
the
backup
copy
will
be
sent.
If
you
do
not
specify
the
first
path,
files
are
backed
up
from
the
current
directory.
If
you
do
not
specify
a
filename
or
extension,
then
all
files
in
the
directory
are
backed
up.
You
can
use
the
wild
card
characters
(*
and
?)
to
specify
groups
of
files
to
be
backed
up.
If
errors
are
encountered
during
the
BACKUP
process,
the
ERRORLEVEL
exit
code
is
set
as
follows:
1.
No
files
could
be
found
to
back
up.
2.
Some
files
were
not
backed
up
due
to
file
conflicts.
3.
Terminated
when
you
pressed
the
Ctrl
+
Break
key
combination.
4.
Terminated
due
to
any
other
type
of
error.
These
codes
can
be
used
with
the
batch
processing
IF
command
to
write
backup
batch
files
that
test
for
errors
during
the
backup
process.
Files
backed
up
using
the
BACKUP
command
are
stored
in a
special,
compacted
format
and
are
therefore
not
usable
for
normal
file
processing.
You
must
use
the
RESTORE
command
to
recall
them
and
store
them
in
the
normal
(un-compacted)
format.
NOTE:
DOS
Versions
3.3
through
5.0
stored
backed
up
files
in a
different
format
than
earlier
versions
(the
new
backup
method
requires
less
disk
space).
In
these
versions,
the
BACKUP
program
creates
two
files
on
the
backup
disk:
BACKUP
and
CONTROL.
The
BACKUP
file
will
contain
all
the
files
that
were
backed
up
and
the
CONTROL
file
will
contain
file
storage
information
such
as
the
paths
and
filenames
of
the
source
files.
Options
/A
-
Does
not
erase
the
files
on
the
target
disk
(DOS
normally
will
erase
existing
files
on
the
target
diskette
before
it
starts
backing
up
the
files).
Use
of
this
option
cancels
the
prompt
to
insert
a
diskette
in
the
target
drive
before
the
copying
starts,
but
after
the
target
disk
is
filled
with
backed-up
files,
you
will
be
prompted
to
insert
a
new
diskette.
NOTE:
The
/A
option
does
not
work
if
the
files
on
the
backup
disk
were
copied
using
a
BACKUP
program
in
DOS
Version
of
3.2
or
earlier.
/F:(size)
-
Formats
the
target
disk
(if
it
is
not
already
formatted).
This
option
uses
the
FORMAT
program
which
must,
therefore,
be
accessible
via
the
current
path.
In
DOS
Versions
4
and
5,
you
can
use
F:(size)
if
the
capacity
of
the
target
diskette
does
not
match
that
of
the
drive
in
which
you
put
it.
For
example,
if
you
are
using
a
360K
diskette
in a
1.2M
drive,
(size)
can
be
160,
180,
320,
360,
720,
1.2,
1.44,
or
(in
DOS
Version
5)
2.88.
/L
-
Makes
an
entry
in
the
backup
log
in
the
file
you
specify
here.
If
you
use
this
option
but
do
not
specify
a
backup
log
file,
the
system
creates
the
file
BACKUP.LOG
in
the
root
directory
of
the
source
drive.
The
backup
log
will
contain:
1.
The
date
and
time
that
the
files
were
backed
up.
2.
The
name
of
the
file
that
was
backed
up.
3.
The
number
of
the
backup
disk
that
contains
the
file.
The
information
stored
in
this
file
can
be
used
when
you
want
to
restore
a
particular
file
from
a
backup
disk.
If
the
backup
log
file
you
specify
already
exists,
the
current
entry
is
added
to
the
existing
file.
/M
-
Only
backs
up
files
that
have
been
modified
since
the
last
time
the
BACKUP
command
was
used.
This
switch
checks
the
archive
attribute
of a
file.
If
the
file`s
archive
attribute
is
set
to
off
(-A),
the
file
will
not
be
backed
up.
NOTE:
If
you
are
backing
up
files
from
a
diskette,
do
not
write-protect
them.
BACKUP
changes
the
archive
attribute
of
each
file
as
it
is
backed
up.
/P
-
Packs
as
many
files
as
possible
onto
each
diskette.
This
option
will
create
a
directory
when
that
is
the
only
way
to
pack
more
files
onto
the
diskette.
/S
-
Causes
files
in
the
specified
directory
and
all
subdirectories
below
the
specified
directory
to
be
backed
up.
/D
- (date)
-
Backs
up
files
only
if
they
have
been
created
or
modified
on
or
after
the
date
you
enter.
/T
-
(time)
-
Backs
up
files
only
if
they
have
been
created
or
modified
on
or
after
the
time
you
enter.
Example
In
the
following
example,
all
files
in
the
drive
D
CHAPTERS
directory
that
begin
with
CHAP
and
with
any
filename
extension
are
backed
up
onto
the
disk
in
drive
A.
backup
d:\chapters\chap*.*
a:
BACKUP
will
display
a
prompt
when
it
is
time
to
insert
the
disks.
If
the
/A
option
is
not
used,
there
will
also
be a
warning
that
any
files
currently
stored
on
the
target
disk
will
be
erased.
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