zfs-backup

This post mentions https://github.com/wyager/zfs-backup for (offsite) backups. Why would they recommend this over something more established like https://github.com/jimsalterjrs/sanoid? Has anybody tried it?

Agreed. I'll shill rsync.net (no affiliation, just a happy customer) and their ZFS VM backup service. It's basically just a lightweight freebsd VM with a big ZFS volume attached, so you can `zfs send` incremental backups to it, and they support meta-snapshotting of your backup machine on their end. I wrote https://github.com/wyager/zfs-backup to manage my automatic incremental backups, and there are a number of other tools like this.

If you haven't seen it, I consider the best-in-class argument parsing library to be Optparse-Applicative. https://github.com/pcapriotti/optparse-applicative It provides an applicative interface, which it turns out is very precisely impedance-matched to the nature of command line arguments. It also integrates nicely with e.g. https://hackage.haskell.org/package/optparse-generic to automatically derive command line parsers from data structures. An example from a recent process of mine: https://github.com/wyager/zfs-backup/blob/master/src/Lib.hs . You can see what the generated help text looks like in the README. The argument parser is automatically derived from the data structure describing the commands available in my program, using optparse-generic. Some extra type annotations on the command data structure provide the detailed document te