updating now that default is preserve hardlinks

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@12 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/rdiff-backup.1

@@ -7,6 +7,10 @@ rdiff-backup \- rsync-like incremental backup utility
 .BI [[[ user@ ] host1.foo ]:: source_directory ]
 .BI [[[ user@ ] host2.foo ]:: destination_directory ]
 
+.B rdiff-backup
+.B {{ -l | --list-increments }
+.BI "| --remove-older-than " time_interval }
+.BI [[[ user@ ] host2.foo ]:: destination_directory ]
 
 .SH DESCRIPTION
 .B rdiff-backup
@@ -72,22 +76,24 @@ automatically excluded.
 Authorize overwriting of a destination directory.  rdiff-backup will
 generally tell you if it needs this.
 .TP
-.BI --hard-links
-Preserve hard links from source to mirror directories.  No increment
-files will themselves be hard linked, but a hard link database will be
-written so that hard links from any dataset will be recreated if
-originally present.  If many hard linked files are present, this
-option can drastically increase memory usage.
-.TP
 .B "-l, --list-increments"
 List the number and date of partial incremental backups contained in
-the specified destination directory.
+the specified destination directory.  This option is incompatible with
+backing up or restoring and must be run in a separate instance of
+rdiff-backup.
 .TP
 .B "-m, --mirror-only"
 Do not create an rdiff-backup-data directory or make any increments.
 In this mode rdiff-backup is similar to rsync (but usually
 slower).
 .TP
+.BI --no-hard-links
+Don't preserve hard links from source to mirror directories.
+Otherwise, no increment files will themselves be hard linked, but a
+hard link database will be written so that hard links from any dataset
+will be recreated if originally present.  If many hard linked files
+are present, this option can drastically decrease memory usage.
+.TP
 .B --no-resume
 Do not resume last aborted backup even if it falls within the resume
 window.
@@ -105,11 +111,17 @@ See the
 section for more information.
 .TP
 .BI "--remove-older-than " time_interval
-Remove the incremental backups in the destination directory that have
-been around longer than time_interval.  The time interval is an
-integer followed by the character s, m, h, D, M, or Y, indicating
+Remove the incremental backup information in the destination directory
+that has been around longer than time_interval.  The time interval is
+an integer followed by the character s, m, h, D, M, or Y, indicating
 seconds, minutes, hours, days, months, or years respectively.  Thus
 32m means 32 minutes, while 1M means one month (30 days).
+
+Note that this option is incompatible with backing up or restoring and
+must be run in a separate instance of rdiff-backup.  Remember also
+that snapshots of deleted files are covered by this operation, so if
+you deleted a file and backed up two weeks ago, and then run
+--remove-older-than 10D today, no trace of that file will remain.
 .TP
 .B --resume
 Resume the last aborted backup.  If no aborted backups are found, exit