The Data Transfer Service typically supports various data migration scenarios, but whether it supports migration where both ends are offline libraries depends on the specific service capabilities and configurations.
In general, if the Data Transfer Service provides offline data transfer or batch migration features, it might be possible to migrate data between two offline libraries. This usually involves exporting data from the source offline library to a portable storage medium, and then importing that data into the target offline library.
For example, if you have two databases stored on local servers and you want to migrate data between them using a Data Transfer Service, you might need to first export the data from the source database to a file or other portable format, and then transfer that file to the target server for import into the destination database.
However, not all Data Transfer Services support this type of offline migration directly. Some services may require at least one end of the migration to be online to facilitate the transfer process.
Regarding Tencent Cloud, its Data Transmission Service (DTS) offers various data migration and synchronization solutions. While DTS is primarily designed for online migration and synchronization between databases, it also provides some offline migration options. For instance, you can use DTS to migrate data from an offline database to an online Tencent Cloud database, or vice versa, by exporting and importing data through files. However, direct migration between two completely offline libraries may not be directly supported by DTS, and you might need to use additional tools or methods for such scenarios.
It's recommended to consult the specific documentation or support resources of the Data Transfer Service you are using to determine its capabilities and limitations regarding offline library migration.