Backblaze doesn't backup /Library on any drive. (maybe everyone but me already knows this?)

I just learned that the Backblaze restriction on backing up /Library isn’t limited to the primary drive; it ignores /Library on all drives, both internal and external.

If you happen to have a directory in the root of an external drive named Library, and you’re using Backblaze, the directory name needs to be changed to something other than Library for Backblaze to include it in the backup.

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Quite a few directory names aren’t backed up – see Exclusions in the Backblaze Settings. But realize that while “/Library” is excluded, “Library” is not so it will back up user Libraries.

It is annoying that you can’t have different exclusion rules for different drives.

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