[Vaupell]

take a look in your admin panel

Scheduled Tasks > Scheduled Task manager >

There you can see the vb cron tasks, and theres also a button that allows you to add your own, IF your really need to.

Cron is just another way of putting Scheduled Tasks,
and if you want backups via cron, and your WEBSITE have that option use that instead
cause that would proberly also backup all your files etc..

while vbcron you can get to backup your database.

but most common use, is keeping rss feeds updated, keeping threads,posts,and other various lists up to date.