make backup.sh delete older than 7 days .zip of files, and change some comments

tools/backup.sh.example

@@ -1,14 +1,17 @@
 #!/bin/bash
+#
+# Dumps jschan database to gzip archive, and archives the static folder
+#
 
-#change these
-APP_NAME=""
+#variables, change me
+APP_NAME="whatever"
 MONGO_DATABASE="jschan"
 MONGO_HOST=""
 MONGO_PORT=""
 MONGO_USER=""
 MONGO_PASSWORD=""
 TIMESTAMP=`date +%F-%H%M`
-BACKUPS_DIR="/path/to/$APP_NAME"
+BACKUPS_DIR="/path/to/backups/folder/$APP_NAME"
 
 #probably dont change these
 DB_BACKUP_NAME="$APP_NAME-$TIMESTAMP.gz"
@@ -16,17 +19,16 @@ FILE_BACKUP_NAME="$APP_NAME-$TIMESTAMP-files.zip"
 DB_ARCHIVE_PATH="$BACKUPS_DIR/$DB_BACKUP_NAME"
 FILE_ARCHIVE_PATH="$BACKUPS_DIR/$FILE_BACKUP_NAME"
 
-#make folder
+#create backup folder
 mkdir -p $BACKUPS_DIR
 
-#backups files
+#archive (no compression) files
 zip -r -0 $FILE_ARCHIVE_PATH ./static
 
-#backup db
+#dump database to .gz archive
 mongodump --username $MONGO_USER --password $MONGO_PASSWORD --authenticationDatabase admin --db $MONGO_DATABASE --archive=$DB_ARCHIVE_PATH --gzip
 rm -rf dump
 
-#delete older than 7 days
+#delete backups older than 7 days
 sudo find $ARCHIVE_PATH -type f -name "*.gz" -mtime +7 -exec rm -f {} \;
-
-exit 0
+sudo find $ARCHIVE_PATH -type f -name "*.zip" -mtime +7 -exec rm -f {} \;