source/packages/com_mokosuitebackup/language/en-GB/com_mokosuitebackup.ini

@@ -352,6 +352,10 @@ COM_MOKOJOOMBACKUP_RUNBACKUP_LEAVE_WARNING="A backup is in progress. Leaving now
 COM_MOKOJOOMBACKUP_RUNBACKUP_AUTOCONTINUE="Automatically continue the update when the backup finishes"
 COM_MOKOJOOMBACKUP_RUNBACKUP_DONT_CLOSE="Please do not close this window or switch to another window until the backup finishes."
 COM_MOKOJOOMBACKUP_RUNBACKUP_UPDATE_RUNNING="Backup complete. The update is now running — please wait and do not close this window…"
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL="Cancel backup"
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL_CONFIRM1="Cancel the backup that is in progress?"
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL_CONFIRM2="Are you sure? The backup will be stopped and the update will NOT continue."
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCELLING="Cancelling…"
 COM_MOKOJOOMBACKUP_RUNBACKUP_CONTINUE_UPDATE="Continue the update"
 
 COM_MOKOJOOMBACKUP_CONFIG_CLEANUP="Cleanup Defaults"

source/packages/com_mokosuitebackup/language/en-US/com_mokosuitebackup.ini

@@ -74,6 +74,10 @@ COM_MOKOJOOMBACKUP_RUNBACKUP_LEAVE_WARNING="A backup is in progress. Leaving now
 COM_MOKOJOOMBACKUP_RUNBACKUP_AUTOCONTINUE="Automatically continue the update when the backup finishes"
 COM_MOKOJOOMBACKUP_RUNBACKUP_DONT_CLOSE="Please do not close this window or switch to another window until the backup finishes."
 COM_MOKOJOOMBACKUP_RUNBACKUP_UPDATE_RUNNING="Backup complete. The update is now running — please wait and do not close this window…"
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL="Cancel backup"
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL_CONFIRM1="Cancel the backup that is in progress?"
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL_CONFIRM2="Are you sure? The backup will be stopped and the update will NOT continue."
+COM_MOKOJOOMBACKUP_RUNBACKUP_CANCELLING="Cancelling…"
 COM_MOKOJOOMBACKUP_RUNBACKUP_CONTINUE_UPDATE="Continue the update"
 
 COM_MOKOJOOMBACKUP_CONFIG_CLEANUP="Cleanup Defaults"

source/packages/com_mokosuitebackup/tmpl/runbackup/default.php

@@ -87,6 +87,9 @@ $config = [
 		'viewRecord' => Text::_('COM_MOKOJOOMBACKUP_RUNBACKUP_VIEW_RECORD'),
 		'leaveWarn'  => Text::_('COM_MOKOJOOMBACKUP_RUNBACKUP_LEAVE_WARNING'),
 		'continueUpdate' => Text::_('COM_MOKOJOOMBACKUP_RUNBACKUP_CONTINUE_UPDATE'),
+		'cancelConfirm1' => Text::_('COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL_CONFIRM1'),
+		'cancelConfirm2' => Text::_('COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL_CONFIRM2'),
+		'cancelling'     => Text::_('COM_MOKOJOOMBACKUP_RUNBACKUP_CANCELLING'),
 	],
 ];
 
@@ -141,6 +144,13 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 				<a href="#" id="msb-rb-continue" class="btn btn-warning d-none"></a>
 				<a href="<?php echo $dashboardUrl; ?>" id="msb-rb-dashboard" class="btn btn-secondary d-none"></a>
 			</div>
+
+			<!-- Cancel is available while the backup is running; requires a double confirmation. -->
+			<div id="msb-rb-cancel-wrap" class="mt-3">
+				<button type="button" id="msb-rb-cancel" class="btn btn-outline-danger">
+					<?php echo htmlspecialchars(Text::_('COM_MOKOJOOMBACKUP_RUNBACKUP_CANCEL'), ENT_QUOTES, 'UTF-8'); ?>
+				</button>
+			</div>
 		</div>
 
 		<!-- Full-bleed progress bar, edge-to-edge along the bottom of the card. -->
@@ -157,6 +167,7 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 	var CFG = <?php echo json_encode($config); ?>;
 	var L = CFG.labels || {};
 	var running = false;
+	var cancelled = false;
 	var lastRecordId = 0;
 
 	var el = {
@@ -172,9 +183,38 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 		continue:  document.getElementById('msb-rb-continue'),
 		dashboard: document.getElementById('msb-rb-dashboard'),
 		autocontinue:     document.getElementById('msb-rb-autocontinue'),
-		autocontinueWrap: document.getElementById('msb-rb-autocontinue-wrap')
+		autocontinueWrap: document.getElementById('msb-rb-autocontinue-wrap'),
+		cancel:     document.getElementById('msb-rb-cancel'),
+		cancelWrap: document.getElementById('msb-rb-cancel-wrap')
 	};
 
+	function hideCancel() { if (el.cancelWrap) { el.cancelWrap.classList.add('d-none'); } }
+
+	/* Cancel the running backup — requires DOUBLE confirmation. Stops the step
+	   loop, tells the server to cancel the record, and leaves to the dashboard
+	   WITHOUT continuing any pending update. */
+	if (el.cancel) {
+		el.cancel.addEventListener('click', function () {
+			if (!running || cancelled) { return; }
+			if (!window.confirm(L.cancelConfirm1 || 'Cancel the backup that is in progress?')) { return; }
+			if (!window.confirm(L.cancelConfirm2 || 'Are you sure? The backup will be stopped and the update will NOT continue.')) { return; }
+
+			cancelled = true;
+			running = false;               /* also disarms the leave-warning */
+			el.cancel.disabled = true;
+			if (el.warn) { el.warn.classList.add('d-none'); }
+			setStatus(L.cancelling || 'Cancelling…');
+
+			var go = function () { window.location.href = CFG.dashboardUrl; };
+			/* Best-effort server-side cancel of the record, then leave. */
+			if (lastRecordId > 0) {
+				post({ task: 'ajax.cancelBackup', id: lastRecordId }).then(go, go);
+			} else {
+				go();
+			}
+		});
+	}
+
 	function setBar(pct, striped) {
 		pct = Math.max(0, Math.min(100, parseInt(pct, 10) || 0));
 		el.bar.style.width = pct + '%';
@@ -211,6 +251,7 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 		setBar(100, false);
 		el.title.textContent = L.complete || 'Backup complete';
 		if (el.warn) { el.warn.classList.add('d-none'); }
+		hideCancel();
 
 		/* Set the one-shot skip flag for THIS action so the following
 		   server-side onExtensionBefore(Update|Uninstall) backup is skipped once
@@ -264,6 +305,7 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 		if (el.warn) { el.warn.classList.add('d-none'); }
 		el.title.textContent = L.failed || 'Backup failed';
 		setStatus(message || 'Backup failed');
+		hideCancel();
 		showActions();
 
 		el.retry.textContent = L.retry || 'Retry';
@@ -285,7 +327,10 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 	async function run() {
 		if (running) { return; }
 		running = true;
+		cancelled = false;
 		el.actions.classList.add('d-none');
+		if (el.cancelWrap) { el.cancelWrap.classList.remove('d-none'); }
+		if (el.cancel) { el.cancel.disabled = false; }
 		setBar(0, true);
 		setPhase('');
 		setStatus(L.starting || 'Starting backup…');
@@ -303,7 +348,7 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 			if (init.record_id) { lastRecordId = init.record_id; }
 
 			var done = false;
-			while (!done) {
+			while (!done && !cancelled) {
 				var step = await post({ task: 'ajax.step', session_id: init.session_id });
 
 				if (!step || step.error) {
@@ -317,9 +362,14 @@ $this->getDocument()->addStyleSheet(Uri::root(true) . '/media/com_mokosuitebacku
 				done = step.done || false;
 			}
 
+			/* User cancelled mid-flight — the click handler already stops the
+			   loop and navigates away, so do not fall through to completion. */
+			if (cancelled) { return; }
+
 			running = false;
 			await onComplete();
 		} catch (err) {
+			if (cancelled) { return; }
 			onError(err && err.message ? err.message : String(err));
 		}
 	}