Backing up file moves with rsync + tar

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http://serverfault.com – I have a mirroring system in place with rsync and it works well. However, moving a file causes it to be transferred again in its entirety. Given what I know about the rsync algorithm's rolling checksum, wouldn't it be possible to: tar all the source files rsync the tar and only incur a block-size penalty for the change in file name, after which the checksum would resynchronise? However, i don't have the temporary spool space for a large .tar file. My questions: Is there an efficient, read/write way to mount a filesystem as a tar, which i can rsync? Is there a way of piping tar | rsync (HowTos)