From here, you can back up your vBulletin database.
SQL Dump of data:
Database tables to include in backup
access
Yes No
adminlog
Yes No
announcement
Yes No
attachment
Yes No
avatar
Yes No
bbcode
Yes No
calendar_events
Yes No
customavatar
Yes No
forum
Yes No
forumpermission
Yes No
icon
Yes No
moderator
Yes No
poll
Yes No
pollvote
Yes No
popupmsgs
Yes No
post
Yes No
privatemessage
Yes No
profilefield
Yes No
replacement
Yes No
replacementset
Yes No
search
Yes No
searchindex
Yes No
session
Yes No
setting
Yes No
settinggroup
Yes No
smilie
Yes No
style
Yes No
subscribeforum
Yes No
subscribethread
Yes No
template
Yes No
templateset
Yes No
thread
Yes No
threadrate
Yes No
thumb
Yes No
user
Yes No
userfield
Yes No
usergroup
Yes No
usertitle
Yes No
word
Yes No
انا لم اقم بالدمج وانتظر الهدية
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استغفر الله