Thank you for the detailed report and the screenshot — that made diagnosing this straightforward.
The root cause is in the configuration UI JavaScript. Integer-type fields (like Count Quota) use a hidden <input> as the real form value and a visible <input type="number"> for display. The visible field only updated the hidden one on a blur event (when focus leaves the field). Using the spinner arrows never fires blur until you click elsewhere, so if you save the page directly after using the arrows, the hidden field still holds the old value.
The fix adds a change event listener alongside the existing blur one, so the hidden value is updated as soon as the spinner or keyboard changes the displayed number, regardless of whether you click elsewhere before saving.
We have prepared a developer's release of Akeeba Backup for Joomla with this fix included. You can download it from:
https://www.akeeba.com/download/developer-releases.html
Please look for Akeeba Backup for Joomla 10.3.4.dev202605211246 at the top of the Akeeba Backup for Joomla section. Download and install it on your site, then try setting Count Quota to a non-preset value using the spinner arrows and saving — it should now save correctly.
This fix will be included in the next stable release.
Moira Fari
Support Specialist
🇬🇧English: native 🕐 My time zone is Asia / Nicosia
Kindly note that my replies are fully vetted by our developers.