I've updated to the latest version and checked that checkbox, and it didn't really help. I still get a bunch of errors like "~/.config/google-chrome/Default/Cookies" changed during backup. And same thing for Firefox. Due to this problem I've decided to not keep renewing my cloudberry subscription and instead look for better backup software that doesn't complain each day that I have my browsers open while the backup runs.

Yes. The warning email says:

completed with warnings, please see below for more details.

Warning

File(s) changed during backup (code: 1629)

I updated a couple of days ago from Cloud Berry backup to the new MSP360 branded version and I've immediately noticed that now I get a backup failure email every day. With the old version things were so much better as I only very rarely got a false positive failure email.