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Why does Time Machine crash my Mac AND the hard...

I'm looking for a Time Machine survival guide. I am using a 1 TB hard disk (connected via USB) to back up my 512 GB MacBook Pro (mid-2014 Retina 15" running the most up-to-date version of Sierra). Of course, that disk is slowly getting full (although I only back up - manually - about once a day) - there are about 40 GB room left. The other day I went through my usual manual backup, and experienced a hard crash of "everything": First the Finder froze - I relaunched from the "Force Quit..." menu. After that, the Mac behaved erratically, so I attempted to restart it. It refused to shut down with the hard disc still attached, but nothing I did would unmount it - so I had to unplug it (it had long since stopped doing anything - the backup was simply stuck in an endless "preparing backup" loop and the Mac froze). Finally I had my Mac back up and running - but the hard disc did not mount and wasn't even visible to "Disc Utility". Fortunately, after several more attempts (rebooting the Mac, turning the HD off and back on), it became visible again and I was able to run Disk Utility on it. No error message, but a long process - and now it seems the hard disk is working again with Time Machine. But of course this is a major scare - the one thing you rely on to save your bacon if the Mac should develop a problem being so unreliable as to CAUSE the Mac to go on a fritz. Any suggestions how to avoid this? Also, any suggestions how to "selectively" remove some old backups so that there is more disk space available on the backup HD?

最后更新：2017-10-22 06:42:11

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