stuck on the preparation of backup time machine

After 20 hours, system preferences says still "preparing backup...". »

Backup of 1 TB (330 GB free) iMac

at the score of 1 TB external drive (170 GB free).

Save on USB3, using an Inateck, WD 4 TB of disk docking station

drive already used for Time Machine.

Last backup 6 months ago.

I can feel humming of backup disk, so something's happening.

Any ideas? I started again the next day, still on the "preparation of backup."

Please follow the troubleshooting steps in the end of Pondini guide, located at Time Machine - troubleshooting

Tags: Mac

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