How to backup only configuration db and only specific blob

Currently we have 2 blobs out of those 1 is used to store raw repository and maven data and other is for storing docker images. We are keeping temporary docker images in blob with huge data size so taking backup of all blobs is very time consuming for us as number of files are huge and we are not using ssd.

I just want to backup raw data and maven repository from my repository and want to skip docker blob.
I have tried restoration but when i am using the repository getting below error

“Attempt to access non-existent blob d25aa6df-2645-45aa-b847-01660be26e06 (/nexus-data/blobs/default/content/vol-10/chap-45/”

Can we resolve this error? As we dont mind if we are not having docker data.