Memory exhausted when trying to restore a snapshot

Hi there,

i can not restore a snapshot because of fatal error:

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 523800 bytes) in /var/www/vhosts/clisr.pl/httpdocs/wp-includes/functions.php on line 1832

i have already increased memory limit in wp-config.php and added php.ini to wordpress directory with memory_limit = "256M" - it did not help.

i use vps server with 2gb ram with plesk panel. is my problem related to wordpress or server misconfiguration? do anyone know how to configure plesk properly?

support access granted.

thank you,
Bart