Mojave and Seagate external backup

I’m not sure what’s “not supported” because web site lists that it’s Mojave compatible, could be certain software.

https://www.seagate.com/gb/en/support/kb/will-my-seagate-drive-work-with-macos-1014-mojave-007859en/

I know this doesn’t help on its own but at least you can now try and find out how to get it working again.

Seagate website offers a troubleshooting link which might be useful.

https://www.seagate.com/gb/en/support/kb/usb-external-troubleshooter-003581en/

This may also help but ignore the push on their software.

https://iboysoft.com/mac-data-recovery/seagate-backup-plus-for-mac-not-recognized-detected-showing-up.html

Alan12C wrote:

The drive does mount but the drop-down menu in Finder no longer includes the option Backup Now and I can find no way of changing this situation.

Is the "Enter TimeMachine" option available? IF not click on Open TimeMachine Options and see if the drive is still selected as a TimeMachine drive.

By ceased to work do you mean the backup software isn't supported or that the drive itself isn't mounting?

Great