Use parallel bzip for compression

backup/backup-turris

@@ -28,6 +28,5 @@
 set -e
 
 renice -n 10 -p $$
-# Use compression externally from pg_dump ‒ xz is better than gz and this can run on separate core
-# The xz -5 is a compromise between size and speed. But we may revisit later, when the DB is larger.
-(echo turris ; pg_dump -Fc -Z 0 turris | xz -5 | gpg -e -r db@turris.cz) | ssh db-backup@217.31.192.99
+# Use compression externally from pg_dump ‒ use multiple processors for that
+(echo turris ; pg_dump -Fc -Z 0 turris | pbzip2 | gpg -e -z 0 -r db@turris.cz) | ssh db-backup@217.31.192.99