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cPanel also has cron jobs that you can set up to run.
That will back up specific directories, like /modules or whatever.
Many people here use the cron jobs to back up the enitre site on a schedule...like daily at midnight....
I use backpack by bluemoon to do my DB backups daily...
Essentially, you want to back up whatever it is you are going to replace or alter. So, as an example, if you have NewBB 1.01 installed, and plan to upgrade to NewBB 2.0 or 2.02...you'd definately want to back up the current NewBB module files and all of the NewBB database info.
As for the IPB users....
are they IPB users from a stand alone IPB install, or are they IPB users from the IPB port into xoops?
Are you trying to make them active IPB users or active XOOPS users?
Are you syncing their posts etc after having imported it all into an XOOPS BB or what?
"Help me, help you..."