it has been asked before, and i believe the answer was that backuppc is coded to use rsync2.x and will only speak that and not use any of the new features. hopefully 3.2 will include rsync3 support.
Has anyone tried out the enhancements of rsync 3.0 yet?
"The 3.0.0 version number is such a large bump up from 2.6.9 due to the
addition of an incremental recursion scan (which helps a lot with large
transfers)"
" - A new incremental-recursion algorithm is now used when rsync is
talking
to another 3.x version. This starts the transfer going more quickly
(before all the files have been found), and requires much less memory.
See the --recursive option in the manpage for some restrictions.
- The default --delete algorithm is now --delete-during when talking to
a
3.x rsync. This is a faster scan than using --delete-before (which is
the default when talking to older rsync versions), and is compatible
with
the new incremental recursion mode."
This might improve the performance in conjunction with BackupPC
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