Rancher 2.x single node backup size

Hi all,

Rancher v2.3.5, single node, custom k8s cluster and ~ 42 nodes (~ 25% are added or removed everyday based on autoscaling).
We backup our rancher single node based on https://rancher.com/docs/rancher/v2.x/en/backups/backups/single-node-backups/ on a regular basis. After 3 months the compressed (tar.gz) backup overall size is more than 425MB and keep growing (~ 2.5MB a week).
Are there any folders or files that can be excluded in order to make the backup size more reasonable ?