On every login ICQ saves the loaded contact list in a local FB file (AOL Feedbag). Because this is just a temporal copy of the contact list, changes of this type have no influence on the server based contact list.
In case you should get into the situation of being unable to login or finding an empty contact list caused by a server error it is pretty helpful to resort to a backup of your contact list. By using ICQ UIN Backup you have the possibility to read out your contacts from the FB file and to save them clearly arranged in a text file. Moreover you can export the whole contact list into a special format to import it with the QIP Contacts Manager. All contacts and groups will be added to any account automatically then.

Info: Because of the irregularity of the FB file errors in displaying the names may occur.