I keep getting this same warning each time I do a backup.
What is it and how to remove it from happening again?

Warning: Skipping file E:\Users
Source error (code 133989376). Cannot find description of this error code. (E:\Users).
Please check the file permissions

It's always the same 2 folders...not any of the files within the folders. When viewing the 2 folders in windows explorer they don't show dates in the future. It was more a curiosity as to why this was happening but I don't need to have you spend time with it when there are more important issues bein...

here is the info...I've never seen a scenario where the file is created in the future?

The last several updates including 9.1.369 I have found to be lightening fast as I previously posted. I'd check all settings making sure you have the same enabled as to when you last had speedy backups.

Original screenshot of my photo taken 7/21/21 [ignore date 7/22/21 below that's when I added the red circle].
Date of modified showing comes from FBackup, source tab in properties,.

Looking at Source in properties, I noticed 2 entries that have a modified date of tomorrow. How can that be? I just updated to 9.1 from a couple of versions back where I had this issue. Hopefully this new issue will now be corrected. I would like to add, the last few versions of FBackup have worked ...

I've un-checked the folder in question for back-up because I don't really need it any more. I'll post back the results should I decide to back it up again.
Thank you for the response.

Unfortunately this didn't fix the issue...had over 2000 warnings in the same cache folder as before.

Thanks for the confirmation!

I see the description of the latest update: Changes in FBackup 9.0.287 (21-May-2021) Fixed: Importing jobs with unavailable plugins failed in certain situations Fixed: Could not apply catalog patch error on backup jobs for some Firefox versions The cache I am referring to in my OP is from Firefox......