Dump too big to fit into a k8s ConfigMap

k8s ConfigMap has a limit of 3MB. This is enough to fit the database but NOT the transactions:

root@neo4j-0:/data# du -hcs *
2.1M	databases
8.0K	dbms
4.0K	server_id
515M	transactions
517M	total
root@neo4j-0:/data# du -hcs databases/*
1.2M	databases/neo4j
0	databases/store_lock
960K	databases/system
2.1M	total
root@neo4j-0:/data# du -hcs transactions/*
258M	transactions/neo4j
258M	transactions/system
515M	total

Any way to optimize this?