PHP Warning / Cannot allocate memory in ../class-updraftplus.php on line 745

i suspect there’s a limit in the my.cfg i need to set/edit to eliminate this error/warning, but just wanted to double check (and also to get a hint of what needs changing if that’s the case)

thanks

full logentry is as follows

PHP Warning:  popen(cd '/..../wp-content/backups'; /usr/bin/mysqldump  --defaults-file=xxxxxxxxxxxx.tmp --max_allowed_packet=1M --quote-names --add-drop-table --skip-comments --skip-set-charset --allow-keywords --dump-date --extended-insert --where=option_name=\'siteurl\' --user='xxxxxxx' --host='localhost' xxxxxxxx 'wp_options' >xxxxxxxxxxxxxxxx.sqltest.tmp,r): Cannot allocate memory in /.../wp-content/plugins/updraftplus/class-updraftplus.php on line 745

https://ww.wp.xz.cn/plugins/updraftplus/