diff --git a/.devcontainer/requirements-dev.txt b/.devcontainer/requirements-dev.txt
index 2aa9d847..a88386cf 100644
--- a/.devcontainer/requirements-dev.txt
+++ b/.devcontainer/requirements-dev.txt
@@ -27,4 +27,5 @@ aiohttp-jinja2
 beautifulsoup4
 firebase-admin
 aiofile
-grpcio
\ No newline at end of file
+grpcio
+aioping
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 1a92a5ed..f97493d3 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -16,5 +16,6 @@
     "editor.defaultFormatter": "vscode.html-language-features",
     "editor.tabSize": 2,
   },
-  "python.analysis.completeFunctionParens": true
+  "python.analysis.completeFunctionParens": true,
+  "files.eol": "\n"
 }
diff --git a/hassio-google-drive-backup/CHANGELOG.md b/hassio-google-drive-backup/CHANGELOG.md
index 685179c8..417eb0d5 100644
--- a/hassio-google-drive-backup/CHANGELOG.md
+++ b/hassio-google-drive-backup/CHANGELOG.md
@@ -1,3 +1,6 @@
+## v0.109.2 [2022-11-15]
+* Fixed a bug where disabling deletion from Google Drive and enabling deltes after upload could cause backups in Google Drive to be deleted.
+
 ## v0.109.1 [2022-11-07]
 * If configured from the browser, defaults to a "dark" theme if haven't already configured custom colors
 * Makes the interval at which the addon publishes sensors to Home Assistant configurable (see the "Uncommon Options" settings)
@@ -15,8 +18,3 @@
 * Fixed an error preventing stopped addons form being started if they hit errors while stopping. 
 * Fixed many, many, many gramatical errors thanks to [@markvader's](https://github.com/markvader) [#665](https://github.com/sabeechen/hassio-google-drive-backup/pull/665).
 * Fixed a missing config option in the addon schema, maximum_upload_chunk_bytes.
-
-## v0.108.2 [2022-06-03]
-* Switched to ignoring 'upgrade' backups by default for new users.
-* Added a warning for existing users if you're not ignoring upgrade backups.
-* Added a warning about google's OOB deprecation for private credential users.
diff --git a/hassio-google-drive-backup/backup/config/settings.py b/hassio-google-drive-backup/backup/config/settings.py
index 66255669..b015ecba 100644
--- a/hassio-google-drive-backup/backup/config/settings.py
+++ b/hassio-google-drive-backup/backup/config/settings.py
@@ -127,6 +127,7 @@ class Setting(Enum):
     EXCHANGER_TIMEOUT_SECONDS = "exchanger_timeout_seconds"
     HA_REPORTING_INTERVAL_SECONDS = "ha_reporting_interval_seconds"
     LONG_TERM_STALE_BACKUP_SECONDS = "long_term_stale_backup_seconds"
+    PING_TIMEOUT = "ping_timeout"
 
     # Old, deprecated settings
     DEPRECTAED_MAX_BACKUPS_IN_HA = "max_snapshots_in_hassio"
@@ -279,6 +280,7 @@ def key(self):
     Setting.EXCHANGER_TIMEOUT_SECONDS: 10,
     Setting.HA_REPORTING_INTERVAL_SECONDS: 10,
     Setting.LONG_TERM_STALE_BACKUP_SECONDS: 60 * 60 * 24,
+    Setting.PING_TIMEOUT: 5
 }
 
 _STAGING_DEFAULTS = {
@@ -410,7 +412,8 @@ def key(self):
     Setting.BACKUP_STARTUP_DELAY_MINUTES: "float(0,)?",
     Setting.EXCHANGER_TIMEOUT_SECONDS: "float(0,)?",
     Setting.HA_REPORTING_INTERVAL_SECONDS: "int(1,)?",
-    Setting.LONG_TERM_STALE_BACKUP_SECONDS: "int(1,)?"
+    Setting.LONG_TERM_STALE_BACKUP_SECONDS: "int(1,)?",
+    Setting.PING_TIMEOUT: "float(0,)?"
 }
 
 PRIVATE = [
diff --git a/hassio-google-drive-backup/backup/debugworker.py b/hassio-google-drive-backup/backup/debugworker.py
index 1b3eb333..e98d446a 100644
--- a/hassio-google-drive-backup/backup/debugworker.py
+++ b/hassio-google-drive-backup/backup/debugworker.py
@@ -1,6 +1,6 @@
 import asyncio
 import socket
-import subprocess
+import aioping
 from datetime import datetime, timedelta
 
 from aiohttp import ClientSession, ClientTimeout
@@ -184,26 +184,21 @@ def formatDate(self, date: datetime):
     async def getPingInfo(self):
         who = self.config.get(Setting.DRIVE_HOST_NAME)
         ips = await self.resolve(who)
-        pings = {who: {}}
+        results = {who: {}}
+        tasks = {who: {}}
         for ip in ips:
-            pings[who][ip] = "Unknown"
-        command = "fping -t 5000 " + " ".join(ips)
-
-        # fping each server
-        process = await asyncio.create_subprocess_shell(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-        stdout_data, stderr_data = await process.communicate()
-
-        for line in stdout_data.decode().split("\n"):
-            for host in pings.keys():
-                for address in pings[host].keys():
-                    if line.startswith(address):
-                        response = line[len(address):].strip()
-                        if response.startswith(":"):
-                            response = response[2:].strip()
-                        if response.startswith("is"):
-                            response = response[3:].strip()
-                        pings[host][address] = response
-        return pings
+            results[who][ip] = "Unknown"
+            tasks[who][ip] = asyncio.create_task(aioping.ping(ip, timeout=self.config.get(Setting.PING_TIMEOUT)))
+
+        # ping each server
+        for server in tasks.keys():
+            for ip in tasks[server].keys():
+                try:
+                    time = await tasks[server][ip]
+                    results[server][ip] = f"{round(time * 1000, 0)} ms"
+                except Exception as e:
+                    results[server][ip] = str(e)
+        return results
 
     async def resolve(self, who: str):
         try:
diff --git a/hassio-google-drive-backup/backup/model/model.py b/hassio-google-drive-backup/backup/model/model.py
index 4461f11b..d7f36531 100644
--- a/hassio-google-drive-backup/backup/model/model.py
+++ b/hassio-google-drive-backup/backup/model/model.py
@@ -78,6 +78,9 @@ def postSync(self) -> None:
     def detail(self) -> str:
         return ""
 
+    def isDestination(self) -> bool:
+        return False
+
     # Gets called after reading state but before any changes are made
     # to check for additional errors.
     def checkBeforeChanges(self) -> None:
@@ -92,6 +95,9 @@ def isWorking(self):
     def might_be_oob_creds(self) -> bool:
         return False
 
+    def isDestination(self) -> bool:
+        return True
+
 
 @singleton
 class Model():
@@ -336,6 +342,9 @@ def _nextPurge(self, source: BackupSource, backups, findNext=False):
         """
         if not source.enabled() or len(backups) == 0:
             return None, None
+        if source.maxCount() == 0 and source.isDestination():
+            # When maxCount is zero for a destination, we should never delete from it.
+            return None, None
         if source.maxCount() == 0 and not self.config.get(Setting.DELETE_AFTER_UPLOAD):
             return None, None
 
diff --git a/hassio-google-drive-backup/backup/model/simulatedsource.py b/hassio-google-drive-backup/backup/model/simulatedsource.py
index 2c50d338..e7289209 100644
--- a/hassio-google-drive-backup/backup/model/simulatedsource.py
+++ b/hassio-google-drive-backup/backup/model/simulatedsource.py
@@ -10,7 +10,7 @@
 
 
 class SimulatedSource(BackupDestination):
-    def __init__(self, name):
+    def __init__(self, name, is_destination=False):
         self._name = name
         self.current: Dict[str, DummyBackupSource] = {}
         self.saved = []
@@ -25,6 +25,10 @@ def __init__(self, name):
         self.backup_type = "Full"
         self.working = False
         self.needConfig = None
+        self.is_destination = is_destination
+
+    def isDestination(self):
+        return self.is_destination
 
     def setEnabled(self, value):
         self._enabled = value
diff --git a/hassio-google-drive-backup/config.json b/hassio-google-drive-backup/config.json
index 6e29f0ca..4ce64d1a 100644
--- a/hassio-google-drive-backup/config.json
+++ b/hassio-google-drive-backup/config.json
@@ -1,6 +1,6 @@
 {
   "name": "Home Assistant Google Drive Backup",
-  "version": "0.109.1",
+  "version": "0.109.2",
   "slug": "hassio_google_drive_backup",
   "description": "Automatically manage backups between Home Assistant and Google Drive",
   "arch": ["armhf", "armv7", "aarch64", "amd64", "i386"],
diff --git a/hassio-google-drive-backup/dev/request_interceptor.py b/hassio-google-drive-backup/dev/request_interceptor.py
index 0d24da11..d5e573dd 100644
--- a/hassio-google-drive-backup/dev/request_interceptor.py
+++ b/hassio-google-drive-backup/dev/request_interceptor.py
@@ -1,12 +1,14 @@
 import re
 from aiohttp.web import Request, Response
-from asyncio import Event, sleep
+from asyncio import Event
 from aiohttp.web_response import json_response
 from injector import singleton, inject
+from backup.time import Time
 
 
 class UrlMatch():
-    def __init__(self, url, fail_after=None, status=None, response=None, wait=False, sleep=None, fail_for=None):
+    def __init__(self, time: Time, url, fail_after=None, status=None, response=None, wait=False, sleep=None, fail_for=None):
+        self.time = time
         self.url: str = url
         self.fail_after: int = fail_after
         self.status: int = status
@@ -21,10 +23,15 @@ def __init__(self, url, fail_after=None, status=None, response=None, wait=False,
         self.fail_for = fail_for
         self.responses = []
         self._calls = 0
+        self.time = time
 
     def addResponse(self, response):
         self.responses.append(response)
 
+    def stop(self):
+        self.wait_event.set()
+        self.trigger_event.set()
+
     def isMatch(self, request):
         return re.match(self.url, request.url.path)
 
@@ -51,7 +58,7 @@ async def _doAction(self, request: Request):
             self.trigger_event.set()
             await self.wait_event.wait()
         elif self.sleep is not None:
-            await sleep(self.sleep)
+            await self.time.sleepAsync(self.sleep, early_exit=self.wait_event)
 
     async def called(self, request: Request):
         if self.fail_after is None or self.fail_after <= 0:
@@ -82,9 +89,14 @@ class RequestInterceptor:
     def __init__(self):
         self._matchers = []
         self._history = []
+        self.time = Time()
+
+    def stop(self):
+        for matcher in self._matchers:
+            matcher.stop()
 
     def setError(self, url, status=None, fail_after=None, fail_for=None, response=None) -> UrlMatch:
-        matcher = UrlMatch(url, fail_after, status=status, response=response, fail_for=fail_for)
+        matcher = UrlMatch(self.time, url, fail_after, status=status, response=response, fail_for=fail_for)
         self._matchers.append(matcher)
         return matcher
 
@@ -93,12 +105,12 @@ def clear(self):
         self._history.clear()
 
     def setWaiter(self, url, attempts=None):
-        matcher = UrlMatch(url, attempts, wait=True)
+        matcher = UrlMatch(self.time, url, attempts, wait=True)
         self._matchers.append(matcher)
         return matcher
 
     def setSleep(self, url, attempts=None, sleep=None, wait_for=None):
-        matcher = UrlMatch(url, attempts, sleep=sleep, fail_for=wait_for)
+        matcher = UrlMatch(self.time, url, attempts, sleep=sleep, fail_for=wait_for)
         self._matchers.append(matcher)
         return matcher
 
diff --git a/hassio-google-drive-backup/dev/simulationserver.py b/hassio-google-drive-backup/dev/simulationserver.py
index d0427bfc..cfc555d0 100644
--- a/hassio-google-drive-backup/dev/simulationserver.py
+++ b/hassio-google-drive-backup/dev/simulationserver.py
@@ -106,6 +106,7 @@ async def start(self, port):
         await site.start()
 
     async def stop(self):
+        self.interceptor.stop()
         await self.runner.shutdown()
         await self.runner.cleanup()
 
diff --git a/hassio-google-drive-backup/requirements-addon.txt b/hassio-google-drive-backup/requirements-addon.txt
index ca38ebc7..78ddeeae 100644
--- a/hassio-google-drive-backup/requirements-addon.txt
+++ b/hassio-google-drive-backup/requirements-addon.txt
@@ -14,3 +14,4 @@ aiofiles
 aiofile
 colorlog
 aiohttp-jinja2
+aioping
diff --git a/hassio-google-drive-backup/tests/conftest.py b/hassio-google-drive-backup/tests/conftest.py
index e983d5f4..e7e0c737 100644
--- a/hassio-google-drive-backup/tests/conftest.py
+++ b/hassio-google-drive-backup/tests/conftest.py
@@ -164,6 +164,7 @@ async def generate_config(server_url: URL, ports, cleandir):
         Setting.PORT: ports.ui,
         Setting.INGRESS_PORT: ports.ingress,
         Setting.BACKUP_STARTUP_DELAY_MINUTES: 0,
+        Setting.PING_TIMEOUT: 0.1,
     })
 
 
diff --git a/hassio-google-drive-backup/tests/helpers.py b/hassio-google-drive-backup/tests/helpers.py
index 574be9bb..b778c83c 100644
--- a/hassio-google-drive-backup/tests/helpers.py
+++ b/hassio-google-drive-backup/tests/helpers.py
@@ -162,8 +162,8 @@ class IntentionalFailure(Exception):
 
 
 class HelperTestSource(SimulatedSource):
-    def __init__(self, name):
-        super().__init__(name)
+    def __init__(self, name, is_destination=False):
+        super().__init__(name, is_destination=is_destination)
         self.allow_create = True
         self.allow_save = True
 
diff --git a/hassio-google-drive-backup/tests/test_debugworker.py b/hassio-google-drive-backup/tests/test_debugworker.py
index d6582612..fdc2213c 100644
--- a/hassio-google-drive-backup/tests/test_debugworker.py
+++ b/hassio-google-drive-backup/tests/test_debugworker.py
@@ -16,12 +16,8 @@ async def test_dns_info(debug_worker: DebugWorker, config: Config):
     config.override(Setting.SEND_ERROR_REPORTS, True)
     config.override(Setting.DRIVE_HOST_NAME, "localhost")
     await debug_worker.doWork()
-    assert debug_worker.dns_info == {
-        'localhost': {
-            '127.0.0.1': 'alive',
-            'localhost': 'alive'
-        }
-    }
+    assert '127.0.0.1' in debug_worker.dns_info['localhost']
+    assert 'localhost' in debug_worker.dns_info['localhost']
 
 
 @pytest.mark.asyncio
@@ -29,12 +25,7 @@ async def test_bad_host(debug_worker: DebugWorker, config: Config):
     skipForWindows()
     config.override(Setting.DRIVE_HOST_NAME, "dasdfdfgvxcvvsoejbr.com")
     await debug_worker.doWork()
-    assert debug_worker.dns_info == {
-        'dasdfdfgvxcvvsoejbr.com': {
-            'dasdfdfgvxcvvsoejbr.com': "Name or service not known"
-        }
-    }
-
+    assert "Name or service not known" in debug_worker.dns_info['dasdfdfgvxcvvsoejbr.com']['dasdfdfgvxcvvsoejbr.com']
 
 @pytest.mark.asyncio
 async def test_send_error_report(time, debug_worker: DebugWorker, config: Config, global_info: GlobalInfo, server, error_store: ErrorStore):
diff --git a/hassio-google-drive-backup/tests/test_model.py b/hassio-google-drive-backup/tests/test_model.py
index 05d72553..c5e7f625 100644
--- a/hassio-google-drive-backup/tests/test_model.py
+++ b/hassio-google-drive-backup/tests/test_model.py
@@ -17,12 +17,12 @@
 
 @pytest.fixture
 def source():
-    return HelperTestSource("Source")
+    return HelperTestSource("Source", is_destination=False)
 
 
 @pytest.fixture
 def dest():
-    return HelperTestSource("Dest")
+    return HelperTestSource("Dest", is_destination=True)
 
 
 @pytest.fixture
@@ -855,6 +855,29 @@ async def test_delete_ignored_upgrade_backup_after_some_time(time: FakeTime, mod
     dest.assertThat(current=1)
 
 
+@pytest.mark.asyncio
+async def test_zero_config_whiled_deleting_backups(time: FakeTime, model: Model, dest: HelperTestSource, source: HelperTestSource, simple_config: Config):
+    """
+    Issue #745 identified that setting setting destination max backups to 0 and "delete after upload"=True would cause destination 
+    backups to get deleted due to an error in the logic for handling purges.  This test verifies that no longer happens.  
+    """
+    source.setMax(1)
+    dest.setMax(1)
+    simple_config.override(Setting.DAYS_BETWEEN_BACKUPS, 1)
+    simple_config.override(Setting.DELETE_AFTER_UPLOAD, True)
+    source.insert("Backup", time.now())
+    await model.sync(time.now())
+    source.assertThat(current=0, deleted=1)
+    dest.assertThat(current=1, saved=1)
+    source.reset()
+    dest.reset()
+
+    dest.setMax(0)
+    await model.sync(time.now())
+    dest.assertThat(current=1)
+    source.assertThat()
+
+
 @pytest.mark.asyncio
 async def test_generational_delete_issue602(time: FakeTime, model: Model, dest: HelperTestSource, source: HelperTestSource, simple_config: Config):
     time.setTimeZone("Europe/Rome")