Properly resolves to the folder /Volumes/external-drive/Mail-Storage/Library/Mail Which normally points to the folder ~/Library/Mail One extra thing to do is to make sure that the alias at ~/Library/Containers//Data/Library/Mail Volumes/external-drive/Mail-Storage/Library/Containers//Data/Library/Mail DownloadsĪnd replace the local folders in ~/Library with macOS aliases to the folders in /Volumes/external-drive/Mail-Storage/Library/. Over to /Volumes/external-drive/Mail-Storage/Library/Mail ~/Library/Containers//Data/Library/Mail Downloads ![]() So my inclination is to copy the two folders ~/Library/Mail Perhaps I should move the ~/Library/Containers//Data/Library/Mail Downloads folder instead, since it seems to contain the majority of the data in the ~/Library/Containers/ folder. This discussion Access to ~/Library/Containers//Data/ denied makes me think that Mojave's "entitlements" might make it challenging to move the entire ~/Library/Containers/ folder. With that said, it looks like ~/Library/Containers/ is filled with all sorts of macOS alias files, so Mail.app does seem to be able to handle all of those. The downside to an alias is that some lower-level Unix stuff does not know how to deal with the macOS alias. Would macOS aliases be preferred over Unix symbolic links? I think that if the name of the external-drive is ever changed, the symbolic links will break but macOS aliases would continue to work. ![]() Volumes/external-drive/Mail-Storage/Library/Containers/Īnd then make symbolic links at the expected places in the ~/Library folder will everything continue to work properly? If I copy them to /Volumes/external-drive/Mail-Storage/Library/Mail ~/Library/Mail Downloads seems to be old with nothing inside it dated after 2013 - I gather that sometime in the 10.9 Mavericks era this was moved to inside ~/Library/Containers/ folder, so it can probably be ignored or even deleted after I look through it to make sure there is nothing of value inside. The following folders in the ~/Library folder seem to be Mail.app related: ~/Library/Mail Splitting the library into two is an option but then involves futzing with two libraries, and working with images in two libraries is not very well supported by Photos.app.Įmail storage on the other hand is just the right size! However I am unsure exactly which folders are important, and the best way of providing the linkage so that everything works properly and is not frequently broken. The simplest thing to move would be the Photos.app library as that can be done by just option-launching the program and selecting the library on the external, however the library is too large (around 300GB), and constantly growing, so that is not an option. The Mac itself is running macOS 10.14 "Mojave". ![]() To free up space on the internal storage, I would like to move some data to the external can be formatted as either "MacOS Extended Journaeld"/HFS+ or APFS. I have a system with fairly small internal storage (500GB) so I have attached a reasonably quick external storage device (256GB) that will be constantly mounted.
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