Time Machine Backups

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Time Machine Backups

Here's one approach to using ZFS for your Time Machine Backups:

While it has been discussed in heated arguments (e.g., https://github.com/openzfsonosx/zfs/issues/66) I still believe there's at least one ZFS feature I'd like to test with Time Machine: compression.

The hypothesis being: an HFS+ sparsebundle stored on a compressed (gzip, lz4), deduped dataset should yield a compression ratio > 1.0. (previously observed 1.4 with compression=on, dedup=off, FreeBSD network Time Machine drives).

To work around compatible disks for Time Machine, we create an HFS+ sparsebundle, store it on ZFS, and set the mounted image as a backup destination – no "TMShowUnsupportedNetworkVolumes" needed.

1. Create, and mount, a sparsebundle from your ZFS filesystem (e.g., with makeImage.sh or Disk Utility).

2. Set your sparsebundle as the (active) backup destination # tmutil setdestination -a /Volumes/Time\ Machine\ Backups

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