Careful with rsync!

After losing a lot of data, here the Golden Rule with rsync.

• Never use

  --delete

  unless you really need it;


• if viable, check what are you going to do with

  -av --dry-run

  (it doens't take so long, also if a lot of data is to be moved);


• it's better to create target directory manually instead of having rsync doing the job:
  

  
  target$ mkdir -p target_dir
  source$ rsync -av source_dir/ target:/target_dir
  

That's all, have fun with rsync.