I have a really strange problem on one of my two Macs, both running latest DT3 on latest Catalina. The other Mac does not have the problem at all.
On the problem Mac I exported all the Files and Folders in a small database to a folder in my user directory. When I try to back up this folder both Carbon Copy Cloner and Chrososync give a load of errors about some of the files, not all. The problem is when reading the exported files (not writing). Chronosync mentions permissions problem.
The permissions on the folder exported from DT3 are:
michaelb: read and write
Staff: read only
Everyone: read only
I have changed these with Get Info to all three being read and write, and applied to all enclosed, but the problem persists. I verified that the permissions had changed on some of the problem files.
I have run repairHomePermissions from Terminal while in Recovery as this Apple KB without effect.
I am currently running full installer again as recommended in the Apple KB.
The same happens with all my six databases, I have just been focussing on this small one for diagnostics.
Another snippet is that if I export the Files and Folders to an external on the good Mac, then move that external to the bad Mac and copy them into the same user folder there, they backup fine. So the problem is some obscure property of some exported files on the bad Mac. I have not seen any other strange behaviour on the bad Mac.
Clearly this is a problem with this one Mac since the other is OK, but I am running out of ideas!
Unfortunately Bad Mac is my main 27" iMac (2017), and Good Mac is a 12" MacBook (2017).
Thanks