Proposal

Please describe the new feature. If applicable, write a minimal example in R code or pseudo-code to show input, usage, and desired output.

I feel the tar_destroy() function need a bit more hint beyond print out which folder it will delete , especially the default value is set to "all". I accidentally delete the whole project while I only intended to delete the local data, perhaps listing the top 50 files that are going to be deleted, and not set "all" as the default argument will make these type of accident harder?