Hi there,
stuff happens, that's okay :) Yes, as long as you don't UNINSTALL WP SlimStat but just remove the files via FTP, your data won't be removed. geoip is the ip geolocalization database, and can be removed without any problems. The 'meat' is in the database, not in your folders...
Also, please check the FAQs for activating a 'backdoor' that allows you to go to the config page even if you locked yourself out of WP SlimStat.
Cheers,
Camu
PS; a vote for my plugin would be a nice way to say thank you.