[RSS Feed/News] FTP Merge Files

[XenForo]

"When uploading files, it's very important that you "merge" files with what's on the server. Some FTP clients may simply replace the contents on the server with exactly the contents that you're uploading. If this happens, some files and data may be lost." In: Installation and upgrades - XenForo Manual

Does filezilla merge or overwrite?

If filezilla cannot do this, what should I use?
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