first

backup.sh

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+# A script to perform incremental backups using rsync
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+
+readonly KEEP="$3"
+readonly SOURCE_DIR="$1"
+readonly BACKUP_DIR="$2"
+readonly DATETIME="$(date '+%Y-%m-%d_%H:%M:%S')"
+readonly BACKUP_PATH="${BACKUP_DIR}/${DATETIME}"
+readonly LATEST_LINK="$(dirname ${BACKUP_DIR})/latest"
+
+mkdir -p "${BACKUP_DIR}"
+
+rsync -avh --delete \
+    "${SOURCE_DIR}/" \
+    --link-dest "${LATEST_LINK}" \
+    --exclude=".cache" \
+    "${BACKUP_PATH}"
+
+rm -rf "${LATEST_LINK}"
+ln -s "${BACKUP_PATH}" "${LATEST_LINK}"
+
+
+COUNT=$(ls ${BACKUP_DIR} | wc -l)
+
+if [[ ${KEEP} -lt ${COUNT} ]]; then
+
+  TRASH=$(ls ${BACKUP_DIR} | sort -r | tail -n $(( ${COUNT} - ${KEEP} )) )
+
+  for t in ${TRASH}; do
+    rm -rf "${BACKUP_DIR}/${t}"
+    echo "REMOVED: ${BACKUP_DIR}/${t}"
+  done
+
+fi
+