Database Backup Errors with Version 5.6.6

A similar post was created a few days ago along this same topic by Matt S.

I am having exactly the same issue since updating to version 5.6.6. My database is quite small (3,077 KB). The error happens with both the automatic, and with manual backups. I tried adjusting my settings (recommended in the answer to Matt’s posting) to Minimum and 20 seconds, but this made no difference. All my weekly backups have been flawless until this last one (now using 5.6.6). The error email I received follows:

[INFO] BackWPup 5.6.6; A project of WP Media
[INFO] WordPress 6.9.1 on https://xxxxx/ (my exclusion for this posting)
[INFO] Log Level: Normal
[INFO] BackWPup job: Database
[INFO] Logfile is: backwpup_log_xxxxx.html
[INFO] Backup file is: 2026-03-09_00-03-13_xxxxx_DBDUMP.zip
[09-Mar-2026 00:03:13] 1. Try to backup database …
[09-Mar-2026 00:03:13] Connected to database dxxxxx on dxxxxx.hosting-data.io
[09-Mar-2026 00:03:13] ERROR: Allowed memory size of 92274688 bytes exhausted (tried to allocate 20480 bytes)
[09-Mar-2026 00:03:14] 2. Try to backup database …
[09-Mar-2026 00:03:14] Connected to database dxxxxx on dxxxxx.hosting-data.io
[09-Mar-2026 00:03:14] ERROR: Allowed memory size of 90177536 bytes exhausted (tried to allocate 528384 bytes)
[09-Mar-2026 00:03:16] 3. Try to backup database …
[09-Mar-2026 00:03:16] Connected to database dxxxxx on dxxxxx.hosting-data.io
[09-Mar-2026 00:03:16] ERROR: Allowed memory size of 90177536 bytes exhausted (tried to allocate 528384 bytes)
[09-Mar-2026 00:03:18] ERROR: Step aborted: too many attempts!
[09-Mar-2026 00:03:18] 1. Trying to generate a manifest file …
[09-Mar-2026 00:03:18] Added manifest.json file with 2.89 KB to backup file list.
[09-Mar-2026 00:03:18] 1. Trying to create backup archive …
[09-Mar-2026 00:03:18] Compressing files as ZipArchive. Please be patient, this may take a moment.
[09-Mar-2026 00:03:18] Backup archive created.
[09-Mar-2026 00:03:18] Archive size is 1.12 KB.
[09-Mar-2026 00:03:18] 2 Files with 3.11 KB in Archive.
[09-Mar-2026 00:03:18] 1 old log deleted
[09-Mar-2026 00:03:18] ERROR: Job has ended with errors in 5 seconds. You must resolve the errors for correct execution.

I’m not a database guru, but looking at things thru IONOS, I see no problems or errors. Indeed, the automatic IONOS database backup is there, though it was last run a few days before this BackWPup attempt (therefore isn’t current with my Sunday activity).

Is it possible to revert back to version 5.6.5 to see if it still works?