Hi Ashley. Homebase Maintenance will remove clients from the database if the datafile is missing. It will think that the client doesn't exist anymore. 

It is possible that the datafile was deleted or messed with by your antivirus software. If this issue happens again you should try to make sure that your antivirus does not scan your datafile. Follow the instructions here: https://proconnect.intuit.com/community/file-actions/help/error-opening-client-cannot-locate-file-wo...