Scripts in Media-->easysocial-->scripts folder

I've been updating easysocial since 3.1.11, and now i notice that in the media folder under easysocial scripts there are static & optimized javascripts for each version, can i safely delete all the previous version js or are they needed?

Same issue is there for easyblog ( Media/com_easyblog/scripts) can i safely delete all the previous version js or are they needed?

This is because my akeeba back up is taking a lot of time on local and the file size is also inflating.

regards