No, unfortunately no other browser than Google Chrome supports the needed HTML5 features, meaning you need Google Chrome to use FileGekko.
That's correct. FileGekko can't get information of file additions or deletions. Remove the changed location and scan it again.
No, don't worry, you files are still on the disk. FileGekko doesn't touch any files on your disk or in your folders.
Sometimes we make backups by copying folders here and there. You might end up having many copies of same files. Well organized files and folders are better protected and use less disk space. FileGekko helps you to achieve this.
If you want to backup your files by having a copy on another disk, single files can be used to show you the files that have not yet been backed up.
First duplicate file (same name, size and date) on different location could be a backup copy, and is blue. Other duplicate files (same location, more than 2 copies) are red.
I have some 250.000 files myself (mostly photos). Some operations become slower, but FileGekko can handle it well.
I'm glad if you like it. At the moment all data is stored locally on the computer that you use it on, if you really would like to have support for multiple computers, please drop me a email.