When the permissions have been updated, reboot the Mac and then try Time Machine again to see if it can now write to disk.Īn extra tip, when looking at the list of users and permissions if you see under users, "unknown" or "searching" this is an indication that permissions have been set for a user that can not be identified. This will take a long time, several hours if the disk has a lot of small files and folders stored.Īfter making any changes it is best to leave the Mac alone while this change propagates across the disk, for a 1TB drive it might take four hours to complete. The revised permissions and ownership will now be written to the disk itself, and all the contents. To the right of the "+ -" boxes is a circle with three dots, click that circle and a pop-up menu appears, click "Apply to enclosed items" The final step is to apply any changes you make to users or privilege settings. If your name is missing from the list of users click the "+" symbol at the bottom of the info pane and a pop-up window will open, look for your name in the list, click it to choose and then click the "Select" button. If your name is missing from the list of users, or you only have "Read only" privilege, click the lock symbol at the lower right of the info pane and enter your user password, then, if your name is already in the list click the privilege box next to your name and change the Privilege setting to Read & Write. To be able to use the disk for a Time Machine backup you must have Read & Write privilege. Occasionally, when upgrading a macOS the users and permissions may become scrambled.Īgainst "your own name" you should have Read & Write Privilege, "staff", if present, should also be Read & Write, finally, "everyone" is normally "Read only". To be able to write and read to the disk you should see (normally) three or more users, "your own name", "staff" and "everyone" Open Finder, locate the external disk in the list of drives, mouse-right-click on the disk and from the pop-up context menu click "Get Info"Īn Info pane will open, at the bottom of the info pane look under Sharing and Permissions. Thanks in advance to anyone who has been through this before and has an answer!īefore erasing the external drive there is one extra check you can do that might resolve the problem. In steps 6 & 8? I say this because when I click "choose" for both source andĭestination, I don't have the option of choosing only the system volume over the data Is this incorrect? Aren't these the "system volumes" as stated Running Big Sur as the destination, and I'm choosing the "root folder" on Macintosh HD Target's volume is read-only." I'm choosing the "root folder" of the external SSD However, after completing steps 7-8, I'm issued a Chronosync readiness state warning: "the right PRO 2TB SSD, Thunderbolt 3) in order to create a bootable backup of my 2017 iMac Pro "Read-Only" Issue When Creating A Bootable Backup of iMac Running Big Sur Via Chronosync I just installed Big Sur 11.6.1 on an external drive (G-Drive mobile
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