All data are stored in a central database. To avoid a loss of these data, you should backup this file (e.g. "Trains.rsd") in regular intervals.

If you use "xMoVe", this point is not available.
Never use the same physical media (e.g. internal hard disk) as a target for the backup. If this media is defect, the backup will be lost, too.
If you use a database-server, this backup-function doesn’t work. Please use the backup-function of the database-server, instead.

You can use existing tools (e.g. TimeMachine) to backup your data, or let this do by "Mac-MoVe" ("Win-MoVe", "Lin-MoVe"). In the preferences, you can select the period for the backup. With this menu point, you start the backup manually. The times given in the preferences are updated.