I don’t know which backup to use on my Apple Watch!

I had some troubles updating my Apple Watch since the storage was full. I got help and unpaired the watch with the phone, then paired it as a new watch (not from backup) and managed to install the update. The person who helped me through chat support told me that I should unpair it again after the update and restore from backup. The problem is that I don’t know which one. The latest backup don’t have anything on it except the update I guess?