Seeker…all is not loss, there are many backed up version of the file on the WD Backup…just a little more tricky to get to. This would still be a brute force method vs the Restore procedure of the Software (I have yet to try, especially on an older file). You could try this to get your file back, then experiment with the WD Restore of an older file… Was your file a virus corrupt or just one that got Over Saved as a bad copy?
Open the folder tree of the WD device and folder ‘WD Backup.swstor’. Open your Name folder, the next Random name folder and you will see a Volume(…) and History folders. The Volume() contains the latest Updates as stored on your PC. The History is all the backups. Keep expanding till you Find your file folder. In Explorer (PC), press the Name Col so that the files are sorted by names…you should see the dates/sizes in it’s col.
Your file is listed with a _LAST (just some pointer) and files with random letters after the name…like monthly.xlsop379. Find the one closest to a correct date/size and copy/paste back to your PC folder. Now you can Rename the file and strip out the random letters. Seems straight forward. Remember, that the resulting file will now have the same name as the previously stored corrupt file so you need to juggle the files around.
On another issue. Do you back up just you necessary data or say your PC name folder. I notice my 6mo daily backup drive was starting to increase in size…a 1T drive. Search online for a PC product called, Treesize…it’s free. Its a pgm that gives you a directory listing of you folder tree, listing the total size and the number of files in each. After running, you can expand the folders to see the size and # of files…scary. On mine, I saw one folder with over 4million files…yup, millon! It was in the Users…AppData/Local…Mozilla. The Mozilla browser creates over a thousand scratch files daily, that because each is unique, gets an individual backup. Heck, I could not even open the folder to view. Treesize has a free and some Pro version but check it out…you can select the drive, or folder and you can save the expanded display as a PDF. I expanded the tree and just did a Snip screen copy…Shocking results. Went back and changed my Schedule…I may even go back and delete some of the bad folders from both the History and Volume() to reduce the # of files…good luck! How much data do you currently have stored on your backup drive?