@@ -29,6 +29,10 @@
 "save the built system" step, if the config changed since); they only copy
 what changed, so that takes a minute or two.
 
+`tools/backup-to-sata` does all of the steps below in one go (run it with
+`sudo`; it only formats the Kingston if it is empty). They are spelled out here
+too, in case you'd rather do them by hand.
+
 **Prepare the backup drive** (once). This erases `sda`, the 112 GB Kingston, which
 is empty now. Check that the name points at `sda` first:
 
@@ -1,0 +1,68 @@
+#!/usr/bin/env bash
+# Backs up what MIGRATION.md section 1 lists to the Kingston SATA SSD (sda):
+# the built system and disko script, WoW's settings and addons, and the home
+# folder. Safe to run again: the first run formats the drive (only if it is
+# empty), later runs only copy what changed.
+#
+#   sudo ~/git/dot/tools/backup-to-sata
+set -euo pipefail
+
+disk=/dev/disk/by-id/ata-KINGSTON_SA400S37120G_50026B76820FD3CE
+mnt=/mnt/backup
+user=vizie
+home=/home/$user
+repo=$home/git/dot
+wow="$home/Games/battlenet/drive_c/Program Files (x86)/World of Warcraft/_retail_"
+
+if [ "$EUID" -ne 0 ]; then
+  echo "Run it with sudo: sudo $0" >&2
+  exit 1
+fi
+if [ ! -e "$disk" ]; then
+  echo "The Kingston drive ($disk) isn't there." >&2
+  exit 1
+fi
+
+# Format only a drive with nothing on it, or reuse the backup drive from an
+# earlier run. Anything else (partitions, another file system) stops here.
+label=$(blkid -o value -s LABEL "$disk" || true)
+fstype=$(blkid -o value -s TYPE "$disk" || true)
+parts=$(lsblk -n -o NAME "$disk" | wc -l)
+if [ "$fstype" = btrfs ] && [ "$label" = backup ]; then
+  echo "== Backup drive already formatted, updating it"
+elif [ -z "$fstype" ] && [ "$parts" -eq 1 ]; then
+  echo "== Formatting $(readlink -f "$disk") (empty Kingston SSD) as 'backup'"
+  mkfs.btrfs -L backup "$disk"
+  udevadm settle
+else
+  echo "The Kingston drive has something on it ($fstype${label:+, label $label}); not touching it." >&2
+  exit 1
+fi
+
+mkdir -p "$mnt"
+if ! mountpoint -q "$mnt"; then
+  mount -o compress=zstd /dev/disk/by-label/backup "$mnt"
+fi
+install -d -o "$user" "$mnt/nix-cache" "$mnt/wow"
+
+echo "== Saving the built system and the disko script"
+sudo -u "$user" bash -euo pipefail -c '
+  cd "$1"
+  sys=$(nix build --no-link --print-out-paths .#nixosConfigurations.desktop.config.system.build.toplevel)
+  disko=$(nix build --no-link --print-out-paths .#nixosConfigurations.desktop.config.system.build.diskoScript)
+  nix copy --to "file://$2/nix-cache?compression=zstd" "$sys" "$disko"
+  echo "$sys" > "$2/nix-cache/system"
+  echo "$disko" > "$2/nix-cache/disko"
+' _ "$repo" "$mnt"
+
+echo "== WoW settings and addons"
+rsync -a --delete "$wow/WTF" "$wow/Interface" "$mnt/wow/"
+
+echo "== Home folder (about 83 GB the first time)"
+rsync -aHAXx --delete --info=progress2 --filter="merge $repo/backup-filter" "$home/" "$mnt/$user/"
+
+sync
+echo "== Done"
+du -sh "$mnt"/*
+df -h "$mnt"
+umount "$mnt"
		`@@ -29,6 +29,10 @@`
29	29	`"save the built system" step, if the config changed since); they only copy`
30	30	`what changed, so that takes a minute or two.`
31	31
	32	+`tools/backup-to-sata` does all of the steps below in one go (run it with
	33	+`sudo`; it only formats the Kingston if it is empty). They are spelled out here
	34	`+too, in case you'd rather do them by hand.`
	35	`+`
32	36	Prepare the backup drive (once). This erases `sda`, the 112 GB Kingston, which
33	37	is empty now. Check that the name points at `sda` first:
34	38
		`@@ -1,0 +1,68 @@`
	1	`+#!/usr/bin/env bash`
	2	`+# Backs up what MIGRATION.md section 1 lists to the Kingston SATA SSD (sda):`
	3	`+# the built system and disko script, WoW's settings and addons, and the home`
	4	`+# folder. Safe to run again: the first run formats the drive (only if it is`
	5	`+# empty), later runs only copy what changed.`
	6	`+#`
	7	`+# sudo ~/git/dot/tools/backup-to-sata`
	8	`+set -euo pipefail`
	9	`+`
	10	`+disk=/dev/disk/by-id/ata-KINGSTON_SA400S37120G_50026B76820FD3CE`
	11	`+mnt=/mnt/backup`
	12	`+user=vizie`
	13	`+home=/home/$user`
	14	`+repo=$home/git/dot`
	15	`+wow="$home/Games/battlenet/drive_c/Program Files (x86)/World of Warcraft/_retail_"`
	16	`+`
	17	`+if [ "$EUID" -ne 0 ]; then`
	18	`+ echo "Run it with sudo: sudo $0" >&2`
	19	`+ exit 1`
	20	`+fi`
	21	`+if [ ! -e "$disk" ]; then`
	22	`+ echo "The Kingston drive ($disk) isn't there." >&2`
	23	`+ exit 1`
	24	`+fi`
	25	`+`
	26	`+# Format only a drive with nothing on it, or reuse the backup drive from an`
	27	`+# earlier run. Anything else (partitions, another file system) stops here.`
	28	`+label=$(blkid -o value -s LABEL "$disk" \|\| true)`
	29	`+fstype=$(blkid -o value -s TYPE "$disk" \|\| true)`
	30	`+parts=$(lsblk -n -o NAME "$disk" \| wc -l)`
	31	`+if [ "$fstype" = btrfs ] && [ "$label" = backup ]; then`
	32	`+ echo "== Backup drive already formatted, updating it"`
	33	`+elif [ -z "$fstype" ] && [ "$parts" -eq 1 ]; then`
	34	`+ echo "== Formatting $(readlink -f "$disk") (empty Kingston SSD) as 'backup'"`
	35	`+ mkfs.btrfs -L backup "$disk"`
	36	`+ udevadm settle`
	37	`+else`
	38	`+ echo "The Kingston drive has something on it ($fstype${label:+, label $label}); not touching it." >&2`
	39	`+ exit 1`
	40	`+fi`
	41	`+`
	42	`+mkdir -p "$mnt"`
	43	`+if ! mountpoint -q "$mnt"; then`
	44	`+ mount -o compress=zstd /dev/disk/by-label/backup "$mnt"`
	45	`+fi`
	46	`+install -d -o "$user" "$mnt/nix-cache" "$mnt/wow"`
	47	`+`
	48	`+echo "== Saving the built system and the disko script"`
	49	`+sudo -u "$user" bash -euo pipefail -c '`
	50	`+ cd "$1"`
	51	`+ sys=$(nix build --no-link --print-out-paths .#nixosConfigurations.desktop.config.system.build.toplevel)`
	52	`+ disko=$(nix build --no-link --print-out-paths .#nixosConfigurations.desktop.config.system.build.diskoScript)`
	53	`+ nix copy --to "file://$2/nix-cache?compression=zstd" "$sys" "$disko"`
	54	`+ echo "$sys" > "$2/nix-cache/system"`
	55	`+ echo "$disko" > "$2/nix-cache/disko"`
	56	`+' _ "$repo" "$mnt"`
	57	`+`
	58	`+echo "== WoW settings and addons"`
	59	`+rsync -a --delete "$wow/WTF" "$wow/Interface" "$mnt/wow/"`
	60	`+`
	61	`+echo "== Home folder (about 83 GB the first time)"`
	62	`+rsync -aHAXx --delete --info=progress2 --filter="merge $repo/backup-filter" "$home/" "$mnt/$user/"`
	63	`+`
	64	`+sync`
	65	`+echo "== Done"`
	66	`+du -sh "$mnt"/*`
	67	`+df -h "$mnt"`
	68	`+umount "$mnt"`