I have had a G Drive USB C 4 TB external hard drive for about a year and it has worked without a problem
i upgraded my I Mac to Mojave and shortly after i got the following message
Backup failed Time machine couldn’t backup to G Drive USB C
I have tried everything i can think of, upgraded the firmware, deleted apps that i read would affect the backup.
I have reformatted using the advice given on Mac forums and still no joy
I bought a 1 TB Seagate portable drive and that backup without any problem
I went to the Apple store where i bought the G Drive and they replaced the drive FOC but i still have the same problems with the new drive.
Any advice would be appreciated