I'm running into a problem very similar to https://discussions.agilebits.com/discussion/25380/database-backup-failed
I'm on version 3.8.22 on Mac OS 10.9.5.
A shared DB is used on two accounts, my wife's and mine. Only under my account, the database backup fails with the same error as in the post above.
I've tried all Troubleshooting stuff under the Help menu. I've manually set the access rights on the Backup folder, I've tried another Backup folder, I've Exported All to the Backup folder which does work, so it's not in the folder permissions I've concluded.
When referring to the Troubleshooting tool on your site, it appears the download links are broken, see
broken link: https://cdn.agilebits.com/dist/1P/mac/util/1Password Troubleshooting.zip
Other versions seems broken as well.
I'd appreciate your help, 1PW has been running fine until 1 weeks ago, I can see because that's when the last successful backup was created.
Gerard from The Netherlands