new prune-old-backups cron script.

crons/prune-old-backups.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+LOCATION=`dirname "$0"`
+
+source "${LOCATION}/../config.sh"
+
+# TODO: The maximum number of backups to keep (when set to 0, all backups are kept)
+maxNrOfBackups="$PRUNE_DOWN_TO"
+
+# TODO: The directory where you store the Nextcloud backups
+backupMainDir="$PRUNE_DIRECTORY"
+
+#
+# Delete old backups
+#
+if [ ${maxNrOfBackups} != 0 ]
+then
+    nrOfBackups=$(ls -l ${backupMainDir} | grep -c ^d)
+
+    if [[ ${nrOfBackups} > ${maxNrOfBackups} ]]
+    then
+        echo "Removing old backups..."
+        ls -t ${backupMainDir} | tail -$(( nrOfBackups - maxNrOfBackups )) | while read -r dirToRemove; do
+            echo "${dirToRemove}"
+            rm -r "${backupMainDir}/${dirToRemove:?}"
+            echo "Done"
+            echo
+        done
+    fi
+fi
+