diff --git a/corhal-dumps/Makefile b/corhal-dumps/Makefile
index 44e0406..882ecf0 100644
--- a/corhal-dumps/Makefile
+++ b/corhal-dumps/Makefile
@@ -22,7 +22,7 @@
 
 # To set the location and the extension of results files
 OUTPUT_DIR := 02-download/$(VERSION_DIR)
-OUTPUT_EXT := json
+OUTPUT_EXT := json.gz
 
 # To generate all files from source directory to target directory
 SOURCE_FILES := $(wildcard $(INPUT_DIR)/*.$(INPUT_EXT))
@@ -56,9 +56,12 @@
 
 02-download/$(VERSION_DIR)/%.json: 01-query/%.txt
 	mkdir -p $(@D)
-	find "$(@D)" -type f -name "$(notdir $@)" -exec mv {} {}.previous \;
-	time ezs $(EZSFLAGS) 02-download.ini < $< > $@
+	time ezs $(EZSFLAGS) 02-download.ini < $< > $@.crdownload
+	mv $@.crdownload $@
+	ls -lhaG $@ | sed -re 's/^[^ ]* //' >> "$(subst json,log,$@)"
 
+02-download/$(VERSION_DIR)/%.json.gz: 02-download/$(VERSION_DIR)/%.json
+	gzip $<
 
 # To prevent deleting intermediate files (for controls)
 .PRECIOUS: 02-download/$(VERSION_DIR)/%.json