Thanks for that useful data.

I had struggled to find it.

There is no capping on my fibre internet service and even monthly caps on 4G/5G mobile plans here are in the 250-500 GB range.

I'm a bit surprised how high you say the witness monthly bandwidth usage is.

I just checked both of my witnesses and one is averaging around 10% of "1 Mbps" (Windows) while the other is averaging around 40 "KiB/s" (Ubuntu).

Thus the Windows Witness is reporting 0.0125 Megabytes per second and the Ubuntu Witness is reporting 0.041 Megabytes per second.

Multiplying by 60 x 60 x 24 x 30 = 2,592,000 to get month usage this is 32,400 Megabytes per month for one and 106,272 Megabytes per month for the other.

I'm not sure why there is such a discrepancy but both measures are well below the 250Gb to 300Gb per month estimate you gave.

This is obviously excluding re-downloading the whole block_log which you should only have to do once.