breath in... backup

boi is a small, opinionated wrapper for Borg that:

• Creates new backup archives with consistent settings
• Uses APFS snapshots on macOS to avoid file drift during a backup
• Prunes archives using one of a handful of simple retention policies

It's designed for my use alone, as a Rust rewrite of wrapper scripts that I wrote for these purposes in the past instead of adopting any more widely accepted Borg automation solution. It's made public in the hope that the code might be useful as a reference (probably for myself more than anyone else).