Hi ... My backup datastore got full so I had to manually delete some dated folders containing the .map files in a repository to make room.
What I want to do now is check the repository so that those blocks that are not referenced in any existing .map are deleted.
That's not how you make room in a deduplicated repository. You have to use the --prune action:
./xsibackup --prune /vmfs/volumes/backup/some-repository/20210330100333
Now that you deleted the .map files, there is no way to know which blocks are exclusive to your new set. Start a new repo.