Nethermind as of January 2023 takes about 860 GiB of space on a snap sync, and then grows by ~ 30 GiB/week.
When it starts to fill its disk, it can be online pruned to free up space again.
Caveat that while several folx have used online pruning successfully, there is risk associated with it. The two failure modes that have been reported are:
- There is 170 GiB or less of free disk space
- Online pruning is run successively without restarting Nethermind in between