There are many reputable offsite backup solutions, which I use as well. Listed below are a few of the many companies that do exactly what you’re looking for.
If you’re ever going to backup your data on media and take it off site, I recommend doing so with a REV drive from IOMEGA. Rev drives hold 30GB uncompressed and 70GB compressed. They are extremely small and personally I feel more comfortable dropping a REV disk versus a hard drive. Accidents happen, and that’s why we backup.
http://www.livevault.com/
http://www.ibackup.com/
http://www.intronis.com/
http://www.amerivault.com/
http://www.offsitebackupsolutions.com/
http://www.ibackup.com/
http://www.intronis.com/