diff --git a/src/event/PollGroup.hxx b/src/event/Backend.hxx
similarity index 77%
rename from src/event/PollGroup.hxx
rename to src/event/Backend.hxx
index 104f1619d..e65eacd4a 100644
--- a/src/event/PollGroup.hxx
+++ b/src/event/Backend.hxx
@@ -17,25 +17,25 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef MPD_EVENT_POLLGROUP_HXX
-#define MPD_EVENT_POLLGROUP_HXX
+#ifndef EVENT_BACKEND_HXX
+#define EVENT_BACKEND_HXX
 
 #include "event/Features.h"
 
 #ifdef _WIN32
 
-#include "PollGroupWinSelect.hxx"
-typedef PollGroupWinSelect PollGroup;
+#include "WinSelectBackend.hxx"
+using EventPollBackend = WinSelectBackend;
 
 #elif defined(USE_EPOLL)
 
-#include "PollGroupEpoll.hxx"
-typedef PollGroupEpoll PollGroup;
+#include "EpollBackend.hxx"
+using EventPollBackend = EpollBackend;
 
 #else
 
-#include "PollGroupPoll.hxx"
-typedef PollGroupPoll     PollGroup;
+#include "PollBackend.hxx"
+using EventPollBackend = PollBackend;
 
 #endif
 
diff --git a/src/event/BackendEvents.hxx b/src/event/BackendEvents.hxx
index eeacb6d43..e47fd59c5 100644
--- a/src/event/BackendEvents.hxx
+++ b/src/event/BackendEvents.hxx
@@ -25,17 +25,17 @@
 #ifdef _WIN32
 
 #include "WinSelectEvents.hxx"
-using PollBackendEvents = WinSelectEvents;
+using EventPollBackendEvents = WinSelectEvents;
 
 #elif defined(USE_EPOLL)
 
 #include "EpollEvents.hxx"
-using PollBackendEvents = EpollEvents;
+using EventPollBackendEvents = EpollEvents;
 
 #else
 
 #include "PollEvents.hxx"
-using PollBackendEvents = PollEvents;
+using EventPollBackendEvents = PollEvents;
 
 #endif
 
diff --git a/src/event/PollGroupEpoll.hxx b/src/event/EpollBackend.hxx
similarity index 85%
rename from src/event/PollGroupEpoll.hxx
rename to src/event/EpollBackend.hxx
index 48e53fd0f..df43509e6 100644
--- a/src/event/PollGroupEpoll.hxx
+++ b/src/event/EpollBackend.hxx
@@ -17,8 +17,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef MPD_EVENT_POLLGROUP_EPOLL_HXX
-#define MPD_EVENT_POLLGROUP_EPOLL_HXX
+#ifndef EVENT_EPOLL_BACKEND_HXX
+#define EVENT_EPOLL_BACKEND_HXX
 
 #include "util/Compiler.h"
 #include "system/EpollFD.hxx"
@@ -26,9 +26,9 @@
 #include <array>
 #include <algorithm>
 
-class PollResultEpoll
+class EpollBackendResult
 {
-	friend class PollGroupEpoll;
+	friend class EpollBackend;
 
 	std::array<epoll_event, 16> events;
 	size_t n_events = 0;
@@ -47,17 +47,17 @@ public:
 	}
 };
 
-class PollGroupEpoll
+class EpollBackend
 {
 	EpollFD epoll;
 
-	PollGroupEpoll(PollGroupEpoll &) = delete;
-	PollGroupEpoll &operator=(PollGroupEpoll &) = delete;
+	EpollBackend(EpollBackend &) = delete;
+	EpollBackend &operator=(EpollBackend &) = delete;
 public:
-	PollGroupEpoll() = default;
+	EpollBackend() = default;
 
 	auto ReadEvents(int timeout_ms) noexcept {
-		PollResultEpoll result;
+		EpollBackendResult result;
 		int ret = epoll.Wait(result.events.data(), result.events.size(),
 				     timeout_ms);
 		result.n_events = std::max(0, ret);
diff --git a/src/event/Loop.cxx b/src/event/Loop.cxx
index d7f5af0db..01daf5d84 100644
--- a/src/event/Loop.cxx
+++ b/src/event/Loop.cxx
@@ -109,7 +109,7 @@ EventLoop::AbandonFD(int _fd)  noexcept
 	assert(!IsAlive() || IsInside());
 #endif
 
-	return poll_group.Abandon(_fd);
+	return poll_backend.Abandon(_fd);
 }
 
 bool
@@ -120,7 +120,7 @@ EventLoop::AddFD(int fd, unsigned events, SocketEvent &event) noexcept
 #endif
 	assert(events != 0);
 
-	if (!poll_group.Add(fd, events, &event))
+	if (!poll_backend.Add(fd, events, &event))
 		return false;
 
 	sockets.push_back(event);
@@ -135,7 +135,7 @@ EventLoop::ModifyFD(int fd, unsigned events, SocketEvent &event) noexcept
 #endif
 	assert(events != 0);
 
-	return poll_group.Modify(fd, events, &event);
+	return poll_backend.Modify(fd, events, &event);
 }
 
 bool
@@ -146,7 +146,7 @@ EventLoop::RemoveFD(int fd, SocketEvent &event) noexcept
 #endif
 
 	event.unlink();
-	return poll_group.Remove(fd);
+	return poll_backend.Remove(fd);
 }
 
 void
@@ -220,7 +220,7 @@ inline bool
 EventLoop::Wait(Event::Duration timeout) noexcept
 {
 	const auto poll_result =
-		poll_group.ReadEvents(ExportTimeoutMS(timeout));
+		poll_backend.ReadEvents(ExportTimeoutMS(timeout));
 
 	for (size_t i = 0; i < poll_result.GetSize(); ++i) {
 		auto &socket_event = *(SocketEvent *)poll_result.GetObject(i);
diff --git a/src/event/Loop.hxx b/src/event/Loop.hxx
index 9f6f38308..a2b7eda81 100644
--- a/src/event/Loop.hxx
+++ b/src/event/Loop.hxx
@@ -21,7 +21,7 @@
 #define MPD_EVENT_LOOP_HXX
 
 #include "Chrono.hxx"
-#include "PollGroup.hxx"
+#include "Backend.hxx"
 #include "SocketEvent.hxx"
 #include "event/Features.h"
 #include "util/Compiler.h"
@@ -130,7 +130,7 @@ class EventLoop final
 
 	/**
 	 * True when the object has been modified and another check is
-	 * necessary before going to sleep via PollGroup::ReadEvents().
+	 * necessary before going to sleep via EventPollBackend::ReadEvents().
 	 */
 	bool again;
 
@@ -148,7 +148,7 @@ class EventLoop final
 	bool uring_initialized = false;
 #endif
 
-	PollGroup poll_group;
+	EventPollBackend poll_backend;
 
 public:
 	/**
diff --git a/src/event/PollGroupPoll.cxx b/src/event/PollBackend.cxx
similarity index 85%
rename from src/event/PollGroupPoll.cxx
rename to src/event/PollBackend.cxx
index a81b2ab2f..9a13ddbc3 100644
--- a/src/event/PollGroupPoll.cxx
+++ b/src/event/PollBackend.cxx
@@ -17,15 +17,15 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "PollGroupPoll.hxx"
+#include "PollBackend.hxx"
 
 #include <cassert>
 
-PollGroupPoll::PollGroupPoll() noexcept = default;
-PollGroupPoll::~PollGroupPoll() noexcept = default;
+PollBackend::PollBackend() noexcept = default;
+PollBackend::~PollBackend() noexcept = default;
 
 bool
-PollGroupPoll::Add(int fd, unsigned events, void *obj) noexcept
+PollBackend::Add(int fd, unsigned events, void *obj) noexcept
 {
 	assert(items.find(fd) == items.end());
 
@@ -42,7 +42,7 @@ PollGroupPoll::Add(int fd, unsigned events, void *obj) noexcept
 }
 
 bool
-PollGroupPoll::Modify(int fd, unsigned events, void *obj) noexcept
+PollBackend::Modify(int fd, unsigned events, void *obj) noexcept
 {
 	auto item_iter = items.find(fd);
 	assert(item_iter != items.end());
@@ -55,7 +55,7 @@ PollGroupPoll::Modify(int fd, unsigned events, void *obj) noexcept
 }
 
 bool
-PollGroupPoll::Remove(int fd) noexcept
+PollBackend::Remove(int fd) noexcept
 {
 	auto item_iter = items.find(fd);
 	assert(item_iter != items.end());
@@ -72,7 +72,7 @@ PollGroupPoll::Remove(int fd) noexcept
 }
 
 PollResultGeneric
-PollGroupPoll::ReadEvents(int timeout_ms) noexcept
+PollBackend::ReadEvents(int timeout_ms) noexcept
 {
 	int n = poll(poll_events.empty() ? nullptr : &poll_events[0],
 		     poll_events.size(), timeout_ms);
diff --git a/src/event/PollGroupPoll.hxx b/src/event/PollBackend.hxx
similarity index 84%
rename from src/event/PollGroupPoll.hxx
rename to src/event/PollBackend.hxx
index da31dc82a..629a6ad58 100644
--- a/src/event/PollGroupPoll.hxx
+++ b/src/event/PollBackend.hxx
@@ -17,8 +17,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef MPD_EVENT_POLLGROUP_POLL_HXX
-#define MPD_EVENT_POLLGROUP_POLL_HXX
+#ifndef EVENT_POLL_BACKEND_HXX
+#define EVENT_POLL_BACKEND_HXX
 
 #include "PollResultGeneric.hxx"
 
@@ -28,7 +28,7 @@
 
 #include <sys/poll.h>
 
-class PollGroupPoll
+class PollBackend
 {
 	struct Item
 	{
@@ -39,11 +39,11 @@ class PollGroupPoll
 	std::vector<pollfd> poll_events;
 	std::unordered_map<int, Item> items;
 
-	PollGroupPoll(PollGroupPoll &) = delete;
-	PollGroupPoll &operator=(PollGroupPoll &) = delete;
+	PollBackend(PollBackend &) = delete;
+	PollBackend &operator=(PollBackend &) = delete;
 public:
-	PollGroupPoll() noexcept;
-	~PollGroupPoll() noexcept;
+	PollBackend() noexcept;
+	~PollBackend() noexcept;
 
 	PollResultGeneric ReadEvents(int timeout_ms) noexcept;
 	bool Add(int fd, unsigned events, void *obj) noexcept;
diff --git a/src/event/SocketEvent.hxx b/src/event/SocketEvent.hxx
index 39d1c331c..17365b14a 100644
--- a/src/event/SocketEvent.hxx
+++ b/src/event/SocketEvent.hxx
@@ -44,7 +44,7 @@ class EventLoop;
  * thread that runs the #EventLoop, except where explicitly documented
  * as thread-safe.
  */
-class SocketEvent final : IntrusiveListHook, public PollBackendEvents {
+class SocketEvent final : IntrusiveListHook, public EventPollBackendEvents {
 	friend class EventLoop;
 	friend class IntrusiveList<SocketEvent>;
 
diff --git a/src/event/PollGroupWinSelect.cxx b/src/event/WinSelectBackend.cxx
similarity index 84%
rename from src/event/PollGroupWinSelect.cxx
rename to src/event/WinSelectBackend.cxx
index 1a2b4365d..e8d7ab12d 100644
--- a/src/event/PollGroupWinSelect.cxx
+++ b/src/event/WinSelectBackend.cxx
@@ -17,7 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "PollGroupWinSelect.hxx"
+#include "WinSelectBackend.hxx"
 #include "WinSelectEvents.hxx"
 
 static constexpr int EVENT_READ = 0;
@@ -29,12 +29,12 @@ bool HasEvent(unsigned events, int event_id) noexcept
 	return (events & (1 << event_id)) != 0;
 }
 
-PollGroupWinSelect::PollGroupWinSelect() noexcept = default;
-PollGroupWinSelect::~PollGroupWinSelect() noexcept = default;
+WinSelectBackend::WinSelectBackend() noexcept = default;
+WinSelectBackend::~WinSelectBackend() noexcept = default;
 
 bool
-PollGroupWinSelect::CanModify(PollGroupWinSelect::Item &item,
-			      unsigned events, int event_id) const noexcept
+WinSelectBackend::CanModify(WinSelectBackend::Item &item,
+			    unsigned events, int event_id) const noexcept
 {
 	if (item.index[event_id] < 0 && HasEvent(events, event_id))
 		return !event_set[event_id].IsFull();
@@ -42,8 +42,8 @@ PollGroupWinSelect::CanModify(PollGroupWinSelect::Item &item,
 }
 
 void
-PollGroupWinSelect::Modify(PollGroupWinSelect::Item &item, SOCKET fd,
-			   unsigned events, int event_id) noexcept
+WinSelectBackend::Modify(WinSelectBackend::Item &item, SOCKET fd,
+			 unsigned events, int event_id) noexcept
 {
 	int index = item.index[event_id];
 	auto &set = event_set[event_id];
@@ -61,7 +61,7 @@ PollGroupWinSelect::Modify(PollGroupWinSelect::Item &item, SOCKET fd,
 }
 
 bool
-PollGroupWinSelect::Add(SOCKET fd, unsigned events, void *obj) noexcept
+WinSelectBackend::Add(SOCKET fd, unsigned events, void *obj) noexcept
 {
 	assert(items.find(fd) == items.end());
 	auto &item = items[fd];
@@ -86,7 +86,7 @@ PollGroupWinSelect::Add(SOCKET fd, unsigned events, void *obj) noexcept
 }
 
 bool
-PollGroupWinSelect::Modify(SOCKET fd, unsigned events, void *obj) noexcept
+WinSelectBackend::Modify(SOCKET fd, unsigned events, void *obj) noexcept
 {
 	auto item_iter = items.find(fd);
 	assert(item_iter != items.end());
@@ -104,7 +104,7 @@ PollGroupWinSelect::Modify(SOCKET fd, unsigned events, void *obj) noexcept
 }
 
 bool
-PollGroupWinSelect::Remove(SOCKET fd) noexcept
+WinSelectBackend::Remove(SOCKET fd) noexcept
 {
 	auto item_iter = items.find(fd);
 	assert(item_iter != items.end());
@@ -117,7 +117,7 @@ PollGroupWinSelect::Remove(SOCKET fd) noexcept
 }
 
 PollResultGeneric
-PollGroupWinSelect::ReadEvents(int timeout_ms) noexcept
+WinSelectBackend::ReadEvents(int timeout_ms) noexcept
 {
 	bool use_sleep = event_set[EVENT_READ].IsEmpty() &&
 			 event_set[EVENT_WRITE].IsEmpty();
diff --git a/src/event/PollGroupWinSelect.hxx b/src/event/WinSelectBackend.hxx
similarity index 90%
rename from src/event/PollGroupWinSelect.hxx
rename to src/event/WinSelectBackend.hxx
index b89fabe34..b55478765 100644
--- a/src/event/PollGroupWinSelect.hxx
+++ b/src/event/WinSelectBackend.hxx
@@ -17,8 +17,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef MPD_EVENT_POLLGROUP_WINSELECT_HXX
-#define MPD_EVENT_POLLGROUP_WINSELECT_HXX
+#ifndef EVENT_WINSELECT_BACKEND_HXX
+#define EVENT_WINSELECT_BACKEND_HXX
 
 #include "PollResultGeneric.hxx"
 
@@ -87,7 +87,7 @@ public:
 	}
 };
 
-class PollGroupWinSelect
+class WinSelectBackend
 {
 	struct Item
 	{
@@ -104,11 +104,11 @@ class PollGroupWinSelect
 	void Modify(Item &item, SOCKET fd, unsigned events,
 		    int event_id) noexcept;
 
-	PollGroupWinSelect(PollGroupWinSelect &) = delete;
-	PollGroupWinSelect &operator=(PollGroupWinSelect &) = delete;
+	WinSelectBackend(WinSelectBackend &) = delete;
+	WinSelectBackend &operator=(WinSelectBackend &) = delete;
 public:
-	PollGroupWinSelect() noexcept;
-	~PollGroupWinSelect() noexcept;
+	WinSelectBackend() noexcept;
+	~WinSelectBackend() noexcept;
 
 	PollResultGeneric ReadEvents(int timeout_ms) noexcept;
 	bool Add(SOCKET fd, unsigned events, void *obj) noexcept;
diff --git a/src/event/meson.build b/src/event/meson.build
index 5331d67af..0218adc77 100644
--- a/src/event/meson.build
+++ b/src/event/meson.build
@@ -12,11 +12,11 @@ if uring_dep.found()
 endif
 
 if is_windows
-  event_sources += 'PollGroupWinSelect.cxx'
+  event_sources += 'WinSelectBackend.cxx'
 elif is_linux and get_option('epoll')
   # epoll support is header-only
 else
-  event_sources += 'PollGroupPoll.cxx'
+  event_sources += 'PollBackend.cxx'
 endif
 
 event = static_library(