Backup over Internet reconnect time


first this is a really nice programm. Thank you for your work
I do a test system with a server and client, both connected over Internet.
After start of the image backup i disconnect at 5% the internetconnection between client and server.
After 60 seconds i reconnect and wait what is the client doing. It takes 20-25 minutes to continue the backup.
This is a long time, can i change something on client or server that this time will reduce to 60 or 120 seconds?

Greetings Mario