Wrote readme file

README.md

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-rsync-time-backup
-=================
+# Rsync time backup
 
-Time Machine style backup with rsync.
+Time Machine style backup with rsync. Should work on Linux, Mac OS X and Windows with Cygwin.
+
+# Installation
+
+    git clone https://github.com/laurent22/rsync-time-backup
+
+or download "rsync_tmbackup.sh".
+
+# Usage
+
+    rsync_tmbackup.sh <source> <destination> [excluded-pattern-path]
+
+## Examples
+    
+    # Backup the home folder to backup_drive
+    
+    rsync_tmbackup.sh /home /mnt/backup_drive  
+
+    # Backup with exclusion list:
+    
+    $ rsync_tmbackup.sh /home /mnt/backup_drive excluded_patterns.txt
+    
+## Exclude file
+
+An optional exclude file can be provided as a third parameter. It should be compabible with the --exclude-from parameter of rsync. See [this tutorial] (https://sites.google.com/site/rsync2u/home/rsync-tutorial/the-exclude-from-option) for more information.
+
+# Features
+
+* Each backup is on its own folder named after the current timestamp. Files can be copied and restored directly, without any intermediate tool.
+
+* Files that haven't changed from one backup to the next are hard-linked to the previous backup so take very little extra space.
+
+* Safety check - the backup will only happen if the destination has explicitely been marked as a backup destination.
+
+* Resume feature - if a backup has failed or was interrupted, the tool will resume from there on the next backup.
+
+* Exclude file - support for pattern-based exclusion via rsync --exclude-from parameter.
+
+* The application is one bash script that can be easily edited.
+
+# TODO
+
+* Check if there's enough space in the destination before doing the backup. Also automatically delete old backups.
+
+* Manage the backups in a way similar to Time Machine - hourly backups for the past 24 hours; daily backups for the past month; weekly backups for the previous months.