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+.th DUMP VIII 11/24/73
+.sh NAME
+dump \*- incremental file system dump
+.sh SYNOPSIS
+.bd dump
+[ key [ arguments ] filesystem ]
+.sh DESCRIPTION
+.it Dump
+will make an incremental file system dump
+on magtape
+of all files changed after a certain date.
+The argument
+.it key,
+specifies the date and other options about the dump.
+.it Key
+consists of characters from
+the set
+.bd iu0hds.
+.s3
+.lp +5 3
+\fBi\fR	the
+dump date is taken from the file
+.bd /etc/ddate.
+.s3
+.lp +5 3
+\fBu\fR	the date just prior to this dump
+is written on
+.bd /etc/ddate
+upon successful completion of this dump.
+.s3
+.lp +5 3
+\fB0\fR	the dump date is taken as the epoch
+(beginning of time).
+Thus this option causes an entire file system dump to be taken.
+.s3
+.lp +5 3
+\fBh\fR	the dump date is some number of hours before the current date.
+The number of hours is taken from the next argument in
+.it arguments.
+.s3
+.lp +5 3
+\fBd\fR	the dump date is some number of days before the current date.
+The number of days is taken from the next argument in
+.it arguments.
+.s3
+.lp +5 3
+\fBs\fR	the size of the dump tape is specified in feet.
+The number of feet is taken from the next argument in
+.it arguments.
+It is assumed that there are 9 standard UNIX records per foot.
+When the specified size is reached,
+the dump will wait for reels to be changed.
+The default size is 1700 feet.
+.s3
+.i0
+If no arguments are given,
+the
+.it key
+is assumed to be
+.bd i
+and the file system is
+assumed to be
+.bd /dev/rp1.
+.s3
+Full dumps
+should be taken on quiet file systems as follows:
+.s3
+	dump 0u /dev/rp1
+.br
+	check -l /dev/rp1
+.s3
+The
+.it check
+will come in handy in case it is necessary
+to resore indiviidual files from this dump.
+Incremental dumps should then be taken
+when desired by:
+.s3
+	dump
+.s3
+When the incremental dumps get cumbersome,
+a new complete dump should be taken.
+In this way,
+a restore requires
+loading of the complete dump tape and only the latest incremental tape.
+.sh FILES
+/dev/mt0	magtape
+.br
+/dev/rp1	default file system
+.br
+/etc/ddate
+.sh "SEE ALSO"
+restor, check(VIII), dump(V)
+.sh BUGS