From bb5855fec97f0670dfae0660f5c047da6a167143 Mon Sep 17 00:00:00 2001
From: Jason Streifling <jason@streifling.com>
Date: Fri, 9 Jan 2026 23:20:35 +0100
Subject: [PATCH] Move system backups to snapper

---
 arch_update | 34 +++++++++++++---------------------
 1 file changed, 13 insertions(+), 21 deletions(-)

diff --git a/arch_update b/arch_update
index 05cbc1e..e56d073 100755
--- a/arch_update
+++ b/arch_update
@@ -1,26 +1,9 @@
-#! /bin/sh -
-#Full Arch Linux Update Script
+#!/bin/sh
+# Full Arch Linux Update Script
 
-SNAPSHOT_DIR=/.snapshots
-DAYS_TO_KEEP=30
+set -e
 
-# Backup system
-if which btrfs >/dev/null; then
-    echo -e '\nCreating backup...' >&2
-
-    cur_time=$(date -Is)
-    cur_time_s=$(date -d $cur_time +%s)
-
-    for file in $(ls "$SNAPSHOT_DIR"); do
-        old_time_s=$(date -d $(echo "$file" | sed 's/[[:alpha:]]\+-//') +%s)
-        if [ $(((cur_time_s - old_time_s) / 86400)) -gt $DAYS_TO_KEEP ]; then
-            sudo btrfs subvolume delete "$SNAPSHOT_DIR"/"$file"
-        fi
-    done
-
-    sudo btrfs subvolume snapshot / "$SNAPSHOT_DIR"/root-$cur_time
-    sudo btrfs subvolume snapshot /home "$SNAPSHOT_DIR"/home-$cur_time
-fi
+BACKUP_LIMIT=3
 
 # Check dependencies
 echo -e '\nInstalling dependencies ...' >&2
@@ -40,6 +23,15 @@ if ! which yay >/dev/null 2>&1; then
     rm -fr yay
 fi
 ! which yaycache >/dev/null 2>&1 && yay -Syu yaycache
+# Backup system
+if which btrfs >/dev/null; then
+    yay -Syu --needed snapper
+    [ ! -f /etc/snapper/configs/root ] && sudo snapper -c root create-config /
+    [ ! $(sudo awk -F '"' '/NUMBER_LIMIT=/ {print $2}' /etc/snapper/configs/root) -eq $BACKUP_LIMIT ] && sudo sed -i.bak "s/\(NUMBER_LIMIT=\"\).*\"/\1$BACKUP_LIMIT\"/" /etc/snapper/configs/root
+
+    echo -e '\nCreating backup...' >&2
+    sudo snapper -c root create -c number
+fi
 
 # Update mirrors
 echo -e '\nUpdating mirrors ...' >&2