Airport Time Capsule Sticks at 71% Verifying Backup

I have a mid-2012 MacBook Pro, running High Sierra. I use an Airport Time Capsule 802.11 ac 2TB for backup, which is connected to a cable router by "bridge." A few weeks ago, I changed the names and passwords on my wifi and base station. I didn't realize for a couple of weeks that the name and password change had stopped the automatic backups. When I connected Time Machine to the same Airport Time Capsule with the new name and password - of course -- it spent hours backing up everything and then proceeded with "verifying" the backup. It stuck at 71% verification and would go no further after hours of effort, and even after leaving it running overnight. I then clicked on a box to skip verification. It now backs up automatically again, but it does not verify the backups at all. How can I make sure the backup is working? I went into Time Machine, copied a couple of files, and the files seem to be there. But I can find no way to verify that it is working properly, which concerns me. This MacBook Pro is going to need to be replaced within a few months, and I want to make sure the backup is running correctly in case it crashes sooner. This "verification" issue arose a month after the warranty expired on the Airport Time Capsule, so I don't qualify for Apple customer service. Skipping the rant, how can I make sure the backup is working? Thanks.