Overall Text limit for all fields ?

Thanks again - so just to be clear (it's been a long day), it is just the TextArea fields I'll have to edit from within CB to restrict their length. If a TextArea is resized to a lower value, will the data within be truncated? Can I change the type (from within CB) without data loss? I know there is a warning that pops up about just that very thing and (of course) I'm going to back up the database, but I want to be sure.

Thanks again.

it is just the TextArea fields I'll have to edit from within CB to restrict their length

Typically, yes.

If a TextArea is resized to a lower value, will the data within be truncated?

On store, yes. New users won't be able to type past the limit. Existing values won't truncate.

Can I change the type (from within CB) without data loss?

Typically, yes, but you should make a backup before doing so.