Devices with very long backup time (3+ minutes) will not be backed up

This is due to server considering backup requests that take longer than 3 minutes as failed/timedout.

We need to be able to specify custom timeout for deviceTypes, or somehow mark a deviceType as "slow backup".
If a backup request is made to a device/devices of such deviceType, it should be made independently (outside of main request grouping), and this request should have its specific timeout set.