[Duplicity-talk] Duplicity for this?

[Grant]

I have three systems in three locations. Two of the systems contain
important data that needs to be backed up.  I was thinking the two
important systems could push to the unimportant system and then pull
each other's data from there. That way the only accessible system is
the unimportant system.

Is duplicity a good fit for this?  Is it a better choice than incremental tar?

Previously I was planning on rsyncing but I would like the data to be
encrypted at rest.  I was planning to rsync to an accessible location
on the destination system and then run rdiff-backup from that location
to an inaccessible location on the same system so old versions of the
data would be clean if the private SSH key were compromised.  Can I
accomplish something similar when using duplicity instead of rsync?

- Grant