kimbruder wrote:
I recently purchased a new Mac Air. Since reconnecting my Seagate external back up drive for time machine suddenly says it is read only & cannot back up. I tried changing permissions & it won't allow me to change it.
https://discussions.apple.com/content/attachment/eb8e042a-64a9-4de6-b930-1b3e3304ccf0
It says I do not have permission?
Was the old Time Machine encrypted...?
You can reformat the drive and start a new backup if no resolve.
Erase and reformat a storage device in Disk Utility on Mac
Erase and reformat a storage device in Disk Utility on Mac - Apple Support
see Time Machine and enclosed links
Types of disks you can use with Time Machine on Mac - Apple Support
3-2-1 Backup Strategy: three copies of your data, two different methods, and one offsite.