From 5f628237cf33668a7b213cd1d1bf4e57ba27ee25 Mon Sep 17 00:00:00 2001
From: Matt Layher <mdlayher@gmail.com>
Date: Wed, 9 Feb 2022 12:54:53 -0500
Subject: [PATCH] nixos/servnerr-3: more frequent ZFS snapshots, verbose
 logging

Signed-off-by: Matt Layher <mdlayher@gmail.com>
---
 nixos/servnerr-3/storage.nix | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/nixos/servnerr-3/storage.nix b/nixos/servnerr-3/storage.nix
index 5a4aba8..a449a93 100644
--- a/nixos/servnerr-3/storage.nix
+++ b/nixos/servnerr-3/storage.nix
@@ -29,11 +29,20 @@ in {
       # Roll up snapshots for long periods of time, we have storage to burn.
       autoSnapshot = {
         enable = true;
+        # Debug output, keep zero-sized snapshots, parallel snapshots, UTC
+        # timestamp, verbose logging.
+        flags = "-d -k -p -u -v";
 
-        # No 15 minute or hourly snapshots, things don't change that often.
-        frequent = 0;
-        hourly = 0;
+        # High frequency snapshots. For quickly rolling back unintended changes,
+        # so we don't keep very many.
+        #
+        # Every 15 minutes for 1 hour.
+        frequent = 4;
+        # Every hour for 4 hours.
+        hourly = 4;
 
+        # Beyond this point, retain more snapshots for long-term archival.
+        #
         # Every day for 2 weeks.
         daily = 14;
         # Every week for 2 months.