.elmo/cache

I've wondered this for a while and suspect I know the answer...

Is .elmo/cache 100% just a cache? I.e., safe to delete, no need save
when doing backups?

In past, when my WL got really whacked, I've deleted the directory and
nothing bad seems to happen. It just gets recreated and life goes on.

Mine is 1.5GB in size at moment...

Is there a proper way to delete/cleanout the cache?

Note: I know about things like:

> ;;days since last access, i.e atime. (default: 50)
> (elmo-cache-expire-by-age  14)
> 
> ;;kilobytes (default 30000)
> (elmo-cache-expire-by-size 1024)

which are more about keeping the cache in check long term. I'm asking
about completely deleting it.

Thomas