I set up backup_migrate to backup Default db. Hit the Backup Now button, and got a WSOD. Error log says:
Allowed memory size of 536870912 bytes exhausted (tried to allocate 294912 bytes) in ../backup_migrate/src/Core/Source/MySQLiSource.php on line 456'
On Apache, php8.1, Mariadb.
If it is relevant, I also saw notice "The backup file could not be saved to 'private://backup_migrate/' because your private files system path has not been set. " In fact I had changed the "Private files" destination to be the asbolute path of a cusotm folder oustide my private files directory, so I assumed that the fact that the "Private files" path with machine name "private_files" was not inside a private files directory would not matter.
Needs review
5.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I was able to fix the issue by making MySQLiSource use unbuffered queries instead of the default, buffered queries.