we want the hyper v maschines image backup on a external usb device that weekle changed. what is the best way for this?
That depends a lot on your sever environment and if you are backing up to vhd/vhdz or raw image files. Could you provide some details?
The user wants to keep external USB backups from his Hyper V machines. (Safe)
what did you mean with more details?
For example if you backup to Linux btrfs the best way to replicate is using btrfs send/receive
.