@ApacheReal,
looks crazy, a player in a player like a virtual machine 
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@abc95086,
did you modify your georgia-reborn-configs.jsonc before you did the backup?
If not, it could be problem with CJK chars. Can you post your file path of your "foobar2000\profile\backup"?
I have googled this error and it could also be a storage issue. Maybe permission error because it will try to automatically
create a new directory "backup" in your foobar2000\profile\ or your HDD/SSD could be corrupted. Hard to know for sure...
First make a backup of your "foobar2000\profile\georgia-reborn\configs\georgia-reborn-config.jsonc" file.
Then delete this config file, a new default config file will be recreated on the next foobar startup.
You can remove the "Added" entry in the metadata grid, open your georgia-reborn-config.jsonc file
and go to section: "metadataGrid": [
Remove the this line:
{ "label": "Added", "val": "[$if2(%added_enhanced%,%added%)]", "age": true },
or you can change it to:
{ "label": "Added", "val": "", "age": true },
-TT