Unavailability of Connect during H2 DB backup (using backup button in administration console as described in documentation - https://help.alteryx.com/connect/current/Administration/DBBackup.htm?tocpath=Administer%7C_____8) while even View is not possible, no matter the capacity of Java Virtual Maschine, can be limiting while large number of data is stored (so backup and following rerun takes a lot of time).