Don,
It's not fragile and complicated. However, if you aren't familiar with basic IT skills, it may seem that way.
What data is in the 2010 MDB file? Only you can answer that, since nobody but the person sitting in front of your computer can answer that. Typically the file date will get updated whenever the file is changed. An older date would imply the date the file was last updated. However, in some circumstances it's just the date the file got created and doesn't change when records are updated.
Kitlog has the capability of opening multiple versions of the MDB file that have different names or are found in different locations. You can open each version that you can find. While the file is opened in Kitlog, look at the records. When was the last update? What data do you see?
I don't mean to be offensive, but you do need to understand some basic IT skills. The fact that you opened up Kitlog using a MDB file on an sub stick is not not important. Like I mentioned, Kitlog can open a file from any location on your computer. It's your responsibility to,understand which physical file you are using and ensuring that you copy that file periodically for archival purposes.
I wouldn't recommend using a file off a usb stick for daily use. In most cases, it's going to be faster if you copy the file to someplace on your hard disk. As to if there are other versions on your hard disk, you'll need to search for *.mdb and see. If you don't understand how to do this, you may want to solicit the assistance form an IT savvy friend.
The contents of the MDB file is your data. You need to protect it like you would any other important data. The web site is just a copy of your data. When you create a new entry, there is a field in that new entry that indicates if that entry has been uploaded to the web site. Once that particular record has been marked as uploaded, it won't be uploaded again. If you edit that record, that field will be updated and be uploaded the next time your run the web update function.
The upload function doesn't really sync the web site database with the specific MDB you are using. It simply uploads the new records. Unfortunately, there is no way to sync with the web database to replace missing records in you revert back to an older version of the MDB file that may be missing records.
I hope this helps and doesn't confuse you further. If all this is seems confusing, I would recommend getting with a friend that understands computers and let them show you how things work.
Bob