Added rsyncable option for gzip using GZ_RSYNCABLE

GZ_RSYNCABLE=TRUE enables --rsyncable for gzip compression. Useful to speed up backups, reduce size of incremental backups, and allow for better deduplication.

Author: teun95

install/assets/functions/10-db-backup

@@ -468,7 +468,10 @@ compression() {
 
    case "${COMPRESSION,,}" in
         gz* )
-            compress_cmd="pigz -q -${COMPRESSION_LEVEL} -p ${PARALLEL_COMPRESSION_THREADS} "
+            if var_true "${GZ_RSYNCABLE}" ; then
+                gz_rsyncable=--rsyncable
+            fi
+            compress_cmd="pigz -q -${COMPRESSION_LEVEL} -p ${PARALLEL_COMPRESSION_THREADS} ${gz_rsyncable}"
             compression_type="gzip"
             extension=".gz"
             dir_compress_cmd=${compress_cmd}