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-Using tar and ssh to efficiently copy files preserving permissions
- Have you had situations where disk-space is sparse, so making full  tars (although compressed) is impossible? Here is an ssh trick that  could help you copy over files without using too much diskspace.
-This trick will tar a directory from a computer, but the file that it  would normally create, is standard out, so it is redirected back to the  script on the computer you are working on. The computer you are working  on extracts the information directly, so there is no location where  (redundant) files are stored.
-**ssh user@machine-where-precious-data-is "tar czpf - /some/important/data" | tar xzpf - -C /new/root/directory**
-You are now directly copying data from the  "machine-where-precious-data-is" to the machine you are working on,  using the benefits of tar (preserving permissions, links, etc) but not  being hindered by the difficulties of tar. (making these possibly large  files and so on.)
- I used this trick to copy users directories from one machine to the other.
-An alternative command, reverse and not crossing filesystem boundries:
-**tar cpf - /some/important/data | ssh user@destination-machine "tar xpf - -C /some/directory/" **