As with any software, Drupal needs to be routinely updated and maintained so that the software has the newest features, bugs fixed, and security holes patched. With Drupal being open-source software, the community involved with the CMS is regularly working on improving the features, fixing problems, and patching any issues that may come up. Because of this, you really want someone keeping your site up to date. Without this being done regularly, you open up your site to attacks, hacks, and more.
I can help you either in one-time updates or to put together a monthly contract to keep your site up-to-date. Since I work on a number of sites, I know when updates come up, which ones should be used, which ones affect other modules, and which ones we should wait on.
If you'd like a quote on maintenance services for your site, please click here.