readme extended

README.md

@@ -3,3 +3,20 @@ kind - kind is not dirvish
 
 kind is a tool to organize backups on harddisks. 
 It is inspired and follows the same principles as dirvish.
+
+A backup server running kind creates images (snapshots) of 
+directory trees on different hosts (clients) on a regular basis. 
+Each image is a complete copy, but unchanged files are 
+shared between different images as hardlink. 
+
+Basic tool for this is rsync, which must be installed on the 
+server and at the clients. rsync may be used via ssh or as server.
+
+For an automated backup via ssh the server must have ssh access 
+to the clients without password (using public key authentication).
+
+If the client runs rsync as server it must be configured to allow the
+server to read the modules to backup. 
+
+Windows clients can backed up using DeltaCopy as rsync server.
+