A full replication replicates all data from the source server to the target server. The replication speed depends on the outbound bandwidth of the source server or the inbound bandwidth of the target server, whichever is smaller.
After the full replication starts, do not restart the source server or Agent, or the migration will fail.
During the full replication, the target server stays locked to prevent any operations. After the migration is complete, it will be automatically unlocked.