Time Machine Backup Fails
I'm running El Capitan 10.11.6 on my iMac (late '08 and it works great - I replaced the disk drive a month ago!) and just a few days ago started getting the pop up every hour that Time Machine can't backup. Worked fine before. I see there is a .inProgress folder in the backups on the last day it worked (there is also 1 "Latest" folder after that). I can't delete the .inProgress folder and when I click the TM clock at the top while holding the Option key "Verify Backups" is not highlighted to click on.
Is this folder why no more backups are working? If so, how do I delete it? Go easy on the tech steps to fix :)
I tried Disk Utilities and got the message OS X can't repair the disk "Time Machine Backups".
Suggestions?
Thanks!!
iMac, OS X 10.11