i've been using BackupPC for years professionally, big or small jobs, and
for my personal stuff too, the modest configuration time is entirely worth
the flexibility, efficiency, and reliability.

if you want multiple copies, the simplest and very reliable approach is
just set up multiple BackupPC servers.

if you want better efficiency than that, one approach is just make copies
of the BackupPC server's data, which i mention also only for the simplicity
of it, but copying can be problematic with large data quantity, usually due
to a very high volume of hardlinks.

for multiple copies i have had very good luck selecting and copying only
the most recent full backups, and subsequent nonredundant incrementals, via
rsync.  a bit more thought was required, but it's been highly efficient.
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