I have 2 Forestry farms on my server where the item store in Black Hole Units for test.
The server spawns
[Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6409ms behind, skipping 128 tick(s)
in every seconds.
If I remove the BHU blocks are all normal. The BHU is connect by thermal dynamics itemducts. other mods are in the crashlog below.
And I have server crash if I run a Resourceful Furnace.
https://pastebin.com/8u3NBVZb
I can't also extract essence from Resourceful Furnace. No bucket works.

Can I get the amount of items they have?

500.000 Wood and 300.000 saplings are in the BHU.