The database on the mobile disk cannot be automatically backed up and exported for backup

[Frank7]

Background: Because the database file is large, so the database is created in the mobile hard disk, usually the computer links the mobile hard disk to use this database.
Software problems：

1. The database on the mobile disk cannot be automatically backed up using local Sync Store, prompting “Not yet synchronized, upload database”
   

   

2. Cannot use File > Export > Database Archive. An error message:Verification of database failed.
   

   

[cgrunenberg]

@Frank7

Cannot use File > Export > Database Archive. An error message:Verification of database failed.

Which errors does File > Verify & Repair Database… report? Anything in Window > Log? In addition, sync stores should never be the only backup.