My external drive has disappeared although i shows up in disc utility, and flash drives also do not appear. Any ideas? Have tried restarting but.....

My back-up has stopped as my external drive is shown as "not accessible" and has disappeared from Finder although it shows up in Disc Utility. Similarly my  USB flash drive has disappeared. Restarting does not help! Any ideas?

That's good news but maybe run a Repair Disk on it anyway given that it has been somewhat unpredictable.
With Time Machine, one expert helper here named pondini has an extensive knowledge of that software and has prepared a lot of material on it. Here is a link to some of it.
http://pondini.org/TM/FAQ.html
http://pondini.org/TM/Troubleshooting.html

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