Thread:Project:Support desk/Backup Mediawiki/reply (6)

I'm not sure what you mean by "the codes which I added". If you modified the source code of MediaWiki -- modified it more than just installing extensions in the extensions directory -- then an upgrade takes more care.

Otherwise, after you have successfully run the update script, you will only need the backups if you need to roll back your wiki to the old version for some reason.