Time machine no longer works after update to Mac OS Sierra

Backup Time Machine has stoped working on two of our Macs, I've updated for Sierra (MacBook Pro 15 "beginning 2013 and iMac early 2016"). They don't backup but are blocked for days now in the 'backup preparation' (connected via gigabit ethernet). The iMac uses our backup NAS (Synology DS216j) and a USB HD (Maxtor), now it can't mount the USB HD or, as the MacBook Pro, get to the point of actually perform a backup on the NAS backup server. All computers (all six of'em, five Mac and a Windows thing) was perfectly support towards the top, but those updated for Sierra no longer.

Someone else who has had this experience and even has a clue what to do about it?

Hi Dr. freon!

Thank you for joining the communities Support from Apple! Looks like you are having problems with the Time Machine backup. I know how it is important to be sure that the computer is properly back up at any time. Check out this article which talks specifically of macOS Sierra: If Time Machine still at the stage of "preparation". He has some suggestions of what can cause problems with the backup of your stay to "prepare".

Another option is to read this article on macOS Sierra: Time Machine troubleshooting.

See you soon!

Tags: Mac OS & System Software

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