Archive folder in Apple Mail is heavily populated
When I receive mail, I read it and either delete it or I file it into one of many mail folders I have made under "On My Mac". And I back up my data in a few different ways, nost notably I clone the entire HD to a backup drive using cloing software (SuperDuper) quite often.
That said, is there any use, reason, need for me to allow the Archive folder to be massively populated with seemingly every email I've received in about the previous three years??? The folder is absolutely huge and it takes my Mail app a long time to close when I shutdown the Mac these days. I'm wondering if having that Archive folder be emptied now and then would help with that Mail app shutdown process.
Any real need or reason to keep this Archive folder populated??? Will it even let me delete its contents since I haven't yet tried???
thanks... bob
MacBook Pro with Retina display, OS X Yosemite (10.10.2)