@userCw5ZWIZC6m You may not remember but at some point in the initial setup of your phone you enabled the backup of your phone to Samsung cloud. In that setup you can select what items are backed up to Samsung cloud.
This article https://www.samsung.com/us/support/answer/ANS00060517/ describes how to restore data from the backup to your phone. It also mentions that you can delete your backup. It looks like it deletes the entire backup, you can't just delete certain items.
After Aug 5th your photos will be deleted from Samsung Cloud by default even if you do nothing.