I have a split database with about 15 users, each with their own front end. The back end is housed on a NAS on our company LAN. There is also a Datto backup device that backs up the NAS regularly throughout the day. The front end has a login form that pulls from a user table. The login form features a combo box to select the user name, and a password test. On a successful login, the login form doesn't close, it goes invisible. This setup has been live like this for about 2 years with no issues. Monday morning last, the 2nd user (more on this in a minute) of the morning, found the combo box empty and couldn't log in. Upon arrival I was consulted, and I quickly discovered that all the records in the user table were gone, but the table itself seemed to be fine. I went to the Datto backups, and found that the table was populated during all Friday, Saturday, and Sunday backups, but the 8:00 AM Monday backup had the empty table. No one is here over the weekend, something clearly happened Monday morning. I have a very rudimentary bit of code that captures every login and logout of any front end, and found that one user successfully logged in at 7:50 AM, and logged out at 7:51 AM. the next attempt happened somewhere between then and the 8:00 AM backup. I can see the possibility of a corruption of a single record, if a user tried to login to the system during a backup maybe, but its never happened before, and folks are in and out of this system creating and altering records all day long every work day, but not a loss of every record in a given table. Any ideas how this would happen?