docs: add release note

docs/release-notes/release-notes-0.19.0.md

@@ -78,6 +78,11 @@
   initial historical sync may be blocked due to a race condition in handling the
   syncer's internal state.
 
+* Add support for [archiving channel backup](https://github.com/lightningnetwork/lnd/pull/9232)
+ in a designated folder which allows for easy referencing in the future. A new 
+ config is added `disable-backup-archive`, with default set to false, to 
+ determine if previous channel backups should be archived or not.
+
 ## Functional Enhancements
 * [Add ability](https://github.com/lightningnetwork/lnd/pull/8998) to paginate 
  wallet transactions.