bin/btrfs-backup

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#!/usr/bin/env bash
LOGFILE="/var/log/btrfs-backup.log"
SNAP_DATE=$(date '+%Y-%m-%d_%H%M%S')
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send_matrix_webhook() {
/usr/local/bin/send-matrix-webhook "btrfs-backup failed on $(hostname)"
}
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trap send_matrix_webhook SIGINT SIGTERM
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# Check if device is mounted
if ! grep "/srv/backup" /etc/mtab >/dev/null; then
echo "[$(date '+%Y-%m-%d %H:%M:%S')] Backup device is not mounted." | tee -a "$LOGFILE"
notify-send -i computer-fail "Backup device is not mounted"
exit 1
fi
create_snapshot() {
if ! btrfs subvolume snapshot -r "$1" "${1}/.snapshots/$2-$SNAP_DATE" >/dev/null; then
echo "[$(date '+%Y-%m-%d %H:%M:%S')] Error creating snapshot of $1" | tee -a "$LOGFILE"
notify-send -i computer-fail "Error creating snapshot of $1"
exit 1
else
echo "[$(date '+%Y-%m-%d %H:%M:%S')] Create snapshot of $1: OK" | tee -a "$LOGFILE"
fi
}
send_snapshot() {
mkdir -p "/srv/backup/$SNAP_DATE"
if ! btrfs send -q "${1}/.snapshots/$2-$SNAP_DATE" | btrfs receive -q "/srv/backup/$SNAP_DATE"; then
echo "[$(date '+%Y-%m-%d %H:%M:%S')] Error sending snapshot of $1 to /srv/backup" | tee -a "$LOGFILE"
notify-send -i computer-fail "Error sending snapshot of $1 to /srv/backup"
exit 1
else
echo "[$(date '+%Y-%m-%d %H:%M:%S')] Send snapshot of $1 to /srv/backup: OK" | tee -a "$LOGFILE"
fi
}
# Create root and home snapshots
create_snapshot "/" "root"
create_snapshot "/home" "home"
# Send root and home snapshots
send_snapshot "/" "root"
send_snapshot "/home" "home"