Erase snapshot backups from website

I have a multisite setup and use Snapshot Pro. I also have a very big website which I need to reduce in size. right now it's over 7 GB. I also just erased all my sub sites and made new ones but I have a lot of snapshot files under uploads. These are created when you "save local" correct? I was thinking I should stop doing that (saving local), and erase all of these from my server and just use google drive so my site doesn't get too big. Can I just erase the plugin and start from scratch? Will that erase all the backups from uploads? Should I erase certain files using FTP?