The mariadb-backup failed to create a backup with the message:
00] 2025-01-07 11:44:25 Was only able to copy log from 14354290020357 to 14357475827057, not 14357476072889; try increasing innodb_log_file_size

I tried tens of combinations but it did not work,
--innodb-log-buffer-size=(from 2m to 20g) --innodb-log-file-mmap=on and off.
ANd with SET GLOBAL innodb_log_file_buffering=ON and set global innodb_log_file_mmap=ON and all other combinations on/off.

Restarting the backup script to create a backup again sometimes helps.
Restarting the MariaDB server sometimes helps.