Why am I not able to backup either Online of Locally?

The error message I get is: "Unable to create a destination data file'
I have Windows 11
Answers
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Additional info: When I try to create a copy of my Quicken file I get a different error message: "You are not authorized to take this action. Please check your credentials or try a different action".
I'm using a private, home-based laptop where I'm the only user, so I'm completely flummoxed by this response. I've been using Quicken for years, so I don't get why I'm having these issues.
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Assuming that there really is no problem with the destination drive and folder you are sending the backup file to …
I'm guessing that something (a crash?) or somebody (Murphy?) stepped on your current Quicken data file and damaged it.
If you haven't done so already, please do the following actions:- Even if you are on the latest software level already, download and install the latest Manual Patch file from https://www.quicken.com/support/update-and-patch-20182019-release-quicken-windows-subscription-product to ensure your Quicken software is up to date and correctly installed.
- Reboot Windows.
- Start Quicken. Do not run One Step Update.
- Run BOTH Validate and Supervalidate to attempt to repair your Quicken data file.
- If nothing helps, try to restore your Quicken data file from an Automatic or Manual backup taken just prior to the problems first occurring.
Validate and Supervalidate instructions
First save a backup file prior to performing these steps
Validate:
• Click File
• Select Validate and Repair File...
• Select Validate File
• If the data file contains investment accounts also select "Rebuild investing lots".
• If you suspect that a damaged Quotes Price History causes your problems, also select "Correct investing price history" functions "Delete" or "Repair and Rebuild".
• Click OK
• Review the Data Log. Anything interesting in there, worthwhile posting here?
• Close Quicken, leave it closed for about 30 secs
• Reopen Quicken and see if the issue persists.Super Validate:
• Click File
• Press and hold both CTRL and Shift keys while you click Validate and Repair File...
• Select Supervalidate File
• Click OK
• Review the Data Log. Anything interesting in there, worthwhile posting here?
• Close Quicken, leave it closed for about 30 secs
• Reopen Quicken and see if the issue persists.0