Hi Klaus,
you can get an overview via the backup card -> Exclude large objects -> Analyze.
administrator/components/com_htprotect shouldn’t be larger than 4-6 MB.

All rollback, backup files and the approx. 32 MB reference ZIP file for core comparison have been moved to
administrator/_htprotect_backups
.
So basically, anything taking up more space ends up there, and administrator/_htprotect_backups can be excluded in other backup tools (like Akeeba).