Chosen Solution

Have you tried the “cp” command from the command line?https://developer.apple.com/legacy/libra… For example, $ cp -av /Volumes/“1TB Macintosh HD”/FolderA/* /Volumes/XXXX/FolderB Note: Substitute “XXXX” for the name of your SSD drive or some other backup drive. You can find this out by typing the command “ls /Volumes” If you provide the -av option, it will continue copying even if errors are detected, and keep a log of the errors and of the files that were successfully copied. Here is an article explaining the process: https://www.cnet.com/news/using-the-os-x… Hopefully, this will copy the bulk of your files over, and leave you with only a few of the files where “its name is too long or includes some characters that are invalid in the destination volume” - let’s call them bad name files. Then, you can individually copy each bad name file while reassigning it a good name. For example, $ cp -av /Volumes/“1TB Macintosh HD”/FolderA/badName.xxx /Volumes/XXXX/FolderB/goodName.xxx Follow these steps for each of the 3 folders that you want to copy over.