is there any How-To available which explains in detail how to setup an own block explorer?
I don't have a How-To, but
someone created a Mempool.space clone with my name, so I'd go from there.
Do you want to use your own block explorer for privacy reasons? Or because of the large number of addresses you want to check?
Currently I'm using the data files of LoyceV which I'm very satisfied with. But as mentioned before, it requires regularly downloading those huge files.
Are you using the 1 GB file (with funded addresses) or the 25 GB file (which includes emptied addresses)? If it's the latter, you can download the daily updates instead of the large file. If it's the former, I wouldn't worry about the 1 GB of data per day. Considering you're running full nodes, I assume you're not limited on bandwidth.
If there's a demand for it, I can try to create a "differences file" for the address list, so you can download only the changes each day. It looks like a combination of
diff and
patch can work, but I'd say downloading a full update is easier.