Does it support encrypted sharding?
Welcome to the forum @MING-LI-JIANG
When I ask for definition of that, I see several. Can you clarify what you want?
How Backup Works explains fragmenting into blocks, but they’re in one folder.
Additional copies can be made, but each copy has all of the data for a backup.
Understanding Restore might help too. The “sharding map” sounds similar to
information in The local database and the dlist files that say where blocks
belonging to source files are stored in the commonly encrypted dblock files.
The blocks are there mainly for deduplication reasons and not to add security,
however it makes backup harder to read than, say, direct copies of the source.
If you’re talking about protecting a key by storing fragments in many locations,
Using the secret provider might give you a way or an idea on how to have that.
The developer might comment better, but can you first clarify what you’re after?