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ZFS High Availability with Asynchronous Replication and zrep
(klarasystems.com)
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
Thanks, that looks like something I might have to try. :) Myself, over the network, I still don't do filesystem level incremental backups, sticking to either directories or virtual machine snapshots (both of which have their shortcomings).