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Is it possibly to run a rdiff-backup to an existing old plain tree copy of the files to backup? What options should be used?

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It sounds like what you're describing is rsync(1). I don't know how rdiff is different from a rsync, but I know that rsync only needs either (1) an rsync daemon listening on the remote system, tcp/873 by default, or (2) an ssh daemon listening on the remote system, tcp/22 by default. There may also be other ways of connecting the system.

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rdiff seems to be based on rsync, and rsync can be used to sync two directories. However, rdiff-backup stores versionated backups, and uses its special metadata therefore. The question was how to make an existing simple copied backup rdiff-backup compatible without copying the whole data again. Maybe its not possible as rdiff-backup collects information while copying (checksums / hashes or soemthing else). – dronus Jan 24 at 11:26
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