Just a heads-up to anyone ... if you're trying to upgrade, backup, import or export and you're stuck on the Processing screen, you are probably using Chrome v83.
You need to upgrade CS Cart to 4.11.4.SP2 ... there's a bug fix for this problem, as noted in the 4.11.4.SP2 changelog.
4.11.4.SP2
[!] Core: Installation and upgrade, backup and restore, export and import, and some other actions didn’t work in Google Chrome v83. Fixed.
HTH.
Tommy.