add weird btrfs backup script

bash/bingus-bak/bak.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+
+if ssh takyon sudo -u bingus test -e /opt/bingus-files/files_snapshots/current; then
+	echo 'Error: an operation is already ongoing' >&2
+	exit 1
+fi
+
+mkdir -p baks
+
+ssh takyon sudo -u bingus btrfs subvol snapshot -r \
+	/opt/bingus-files/files \
+	/opt/bingus-files/files_snapshots/current
+
+if ssh takyon sudo -u bingus test -e /opt/bingus-files/files_snapshots/last; then
+	echo "taking incremental backup" >&2
+	out=baks/"$(date --rfc-3339=seconds)"
+	ssh takyon sudo btrfs send \
+		-p /opt/bingus-files/files_snapshots/last \
+		/opt/bingus-files/files_snapshots/current \
+		--compressed-data > "$out"
+	du -h "$out"
+	echo "removing parent" >&2
+	ssh takyon sudo -u bingus btrfs property set -ts /opt/bingus-files/files_snapshots/last ro false
+	ssh takyon sudo -u bingus btrfs subvol delete /opt/bingus-files/files_snapshots/last
+else
+	echo "taking first copy" >&2
+	ssh takyon sudo btrfs send \
+		/opt/bingus-files/files_snapshots/current \
+		--compressed-data > baks/epoch
+	du -h baks/epoch
+fi
+
+echo "renaming current to last" >&2
+
+ssh takyon sudo -u bingus mv \
+	/opt/bingus-files/files_snapshots/current \
+	/opt/bingus-files/files_snapshots/last
+
+echo "backup complete" >&2
+

bash/bingus-bak/restore.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+
+if [[ -e restoration ]]; then
+	echo 'Error: an operation is already ongoing' >&2
+	exit 1
+fi
+
+mkdir restoration
+
+echo "restoring baks/epoch" >&2
+sudo btrfs receive restoration -f baks/epoch
+
+find baks -maxdepth 1 -type f | sort | head -n-1 | while read -r file; do
+	echo "restoring $file" >&2
+	mv restoration/{current,last}
+	sudo btrfs receive restoration -f "$file"
+	sudo btrfs subvol delete restoration/last
+done
+
+echo "restoration complete" >&2