diff --git a/appinfo/info.xml b/appinfo/info.xml
index 054b554..63d18f4 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -14,4 +14,8 @@
     <dependencies>
         <nextcloud min-version="25" max-version="26"/>
     </dependencies>
+    <settings>
+        <admin>OCA\GroupfolderFilesystemSnapshots\Settings\SnapshotsAdmin</admin>
+        <admin-section>OCA\GroupfolderFilesystemSnapshots\Sections\SnapshotsSection</admin-section>
+    </settings>
 </info>
diff --git a/lib/Entity/Snapshot.php b/lib/Entity/Snapshot.php
new file mode 100644
index 0000000..e571a7d
--- /dev/null
+++ b/lib/Entity/Snapshot.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace OCA\GroupfolderFilesystemSnapshots\Entity;
+
+use JsonSerializable;
+
+class Snapshot implements JsonSerializable {
+    /** @var string */
+    private $id;
+
+    public function __construct(string $id) {
+        $this->id = $id;
+    }
+
+    public function jsonSerialize(): mixed {
+		return [
+			'id' => $this->id
+		];
+	}
+}
diff --git a/lib/Manager/DiffManager.php b/lib/Manager/DiffManager.php
new file mode 100644
index 0000000..f0f0852
--- /dev/null
+++ b/lib/Manager/DiffManager.php
@@ -0,0 +1,208 @@
+<?php
+
+namespace OCA\GroupfolderFilesystemSnapshots\Manager;
+
+class DiffManager {
+
+    public function __construct(){
+    }
+
+    private function seperateFilesFromFolders($parentDir, $items) {
+        $files = [];
+        $folders = [];
+
+        foreach($items as $item) {
+            if(is_dir($parentDir . DIRECTORY_SEPARATOR . $item)) {
+                $folders[] = $item;
+            } else {
+                $files[] = $item;
+            }
+        }
+
+        return array($files, $folders);
+    }
+
+    private function getFilesAndFolders($dir) {
+        $scan = array_diff(scandir($dir), array('..', '.'));
+
+        return $this->seperateFilesFromFolders($dir, $scan);
+    }
+
+    private function getFilesizesOfFiles($prefix, array $files) {
+        $result = array();
+        foreach($files as $index=>$file) {
+            $result[$index] = filesize($prefix . DIRECTORY_SEPARATOR . $file);
+        }
+
+        return $result;
+    }
+
+    function diffDirectories($dir1, $dir2, $prefix = "") {
+        $diff = [];
+
+        $scan1files = [];
+        $scan1folders = [];
+        if(file_exists($dir1) && is_dir($dir1)) {
+            list($scan1files, $scan1folders) = $this->getFilesAndFolders($dir1);
+        }
+        
+        $scan2files = [];
+        $scan2folders = [];
+        if(file_exists($dir2) && is_dir($dir2)) {
+            list($scan2files, $scan2folders) = $this->getFilesAndFolders($dir2);
+        }
+
+        $fileCreations = array_diff($scan2files, $scan1files);
+        $fileCreationsFilesizes = $this->getFilesizesOfFiles($dir2, $fileCreations);
+
+        $fileDeletions = array_diff($scan1files, $scan2files);
+        $fileDeletionsFilesizes = $this->getFilesizesOfFiles($dir1, $fileDeletions);
+
+        $filePossibleEdits = array_intersect($scan1files, $scan2files);
+
+        $allSubfolders = array_unique(array_merge($scan1folders, $scan2folders));
+
+        /*$diff[] = [
+            "type" => "DEBUG",
+            "prefix" => $prefix,
+            "fileCreations" => $fileCreations,
+            "fileCreationsFilesizes" => $fileCreationsFilesizes,
+            "fileDeletions" => $fileDeletions,
+            "fileDeletionsFilesizes" => $fileDeletionsFilesizes,
+            //"folderCreations" => $folderCreations,
+            //"folderDeletions" => $folderDeletions,
+            "allSubfolders" => $allSubfolders,
+        ];*/
+
+        // search for creations and deletions, that are actually renames
+        foreach($fileCreations as $creationIndex=>$creation) {
+            $creationPath = $dir2 . DIRECTORY_SEPARATOR . $creation;
+            $creationSize = $fileCreationsFilesizes[$creationIndex];
+            
+            $renameContenders = array_keys($fileDeletionsFilesizes, $creationSize);
+
+            if(sizeof($renameContenders) != 0) {
+                /*$diff[] = [
+                    "type" => "DEBUG",
+                    "comparing" => [
+                        "creation" => $creationIndex,
+                        "deletions" => $renameContenders,
+                    ],
+                ];*/
+
+                $creationSHA = sha1_file($creationPath);
+                foreach($renameContenders as $contender) {
+                    $deletion = $fileDeletions[$contender];
+                    $deletionPath = $dir1 . DIRECTORY_SEPARATOR . $deletion;
+                    $deletionSHA = sha1_file($deletionPath);
+
+                    if($deletionSHA == $creationSHA) {
+                        $diff[] = [
+                            "type" => "RENAME",
+                            "before" => [
+                                "exists" => True,
+                                "path" => $prefix . DIRECTORY_SEPARATOR . $deletion,
+                                "size" => $creationSize,
+                            ],
+                            "afterwards" => [
+                                "exists" => True,
+                                "path" => $prefix . DIRECTORY_SEPARATOR . $creation,
+                                "size" => $creationSize,
+                            ]
+                            
+                        ];
+
+                        unset($fileCreations[$creationIndex]);
+                        unset($fileDeletions[$contender]);
+
+                        break;
+                    }
+                }
+            }
+        }
+
+        foreach($fileCreations as $index=>$creation) {
+            $diff[] = [
+                "type" => "CREATION",
+                "before" => [
+                    "exists" => False,
+                ],
+                "afterwards" => [
+                    "exists" => True,
+                    "path" => $prefix . DIRECTORY_SEPARATOR . $creation,
+                    "size" => $fileCreationsFilesizes[$index],
+                ]
+            ];
+        }
+
+        foreach($fileDeletions as $index=>$deletion) {
+            $diff[] = [
+                "type" => "DELETION",
+                "before" => [
+                    "exists" => True,
+                    "path" => $prefix . DIRECTORY_SEPARATOR . $deletion,
+                    "size" => $fileDeletionsFilesizes[$index],
+                ],
+                "afterwards" => [
+                    "exists" => False,
+                ],
+            ];
+        }
+
+        foreach($filePossibleEdits as $possibleEdit) {
+            $file1 = $dir1 . DIRECTORY_SEPARATOR . $possibleEdit;
+            $file2 = $dir2 . DIRECTORY_SEPARATOR . $possibleEdit;
+            $file1Size = filesize($file1);
+            $file2Size = filesize($file2);
+
+            if(filemtime($file1) == filemtime($file2)) {
+                //not different because same mtime
+                continue;
+            } else {
+                // mtime different, but could just have gotten touched without modifications
+                if($file1Size == $file2Size) {
+                    // if filesize is the same check for binary differences
+                    $handle1 = fopen($file1, 'rb');
+                    $handle2 = fopen($file2, 'rb');
+
+                    $filesdifferent = false;
+
+                    while(!feof($handle1)) {
+                        if(fread($handle1, 8192) != fread($handle2, 8192)) {
+                            // files are different
+                            $filesdifferent = true;
+                            break;
+                        }
+                    }
+
+                    fclose($handle1);
+                    fclose($handle2);
+
+                    if(!$filesdifferent) {
+                        continue;
+                    }
+                }
+            }
+
+            
+            $diff[] = [
+                "type" => "EDIT",
+                "before" => [
+                    "path" => $prefix . DIRECTORY_SEPARATOR . $possibleEdit,
+                    "size" => $file1Size,
+                ],
+                "afterwards" => [
+                    "path" => $prefix . DIRECTORY_SEPARATOR . $possibleEdit,
+                    "size" => $file2Size,
+                ]
+                
+            ];
+        }
+
+        foreach($allSubfolders as $folder) {
+            array_push($diff, ...($this->diffDirectories($dir1 . DIRECTORY_SEPARATOR . $folder, $dir2 . DIRECTORY_SEPARATOR . $folder, $prefix . DIRECTORY_SEPARATOR . $folder)));
+        }
+
+        return $diff;
+    }
+}
\ No newline at end of file
diff --git a/lib/Manager/PathManager.php b/lib/Manager/PathManager.php
new file mode 100644
index 0000000..662bbca
--- /dev/null
+++ b/lib/Manager/PathManager.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace OCA\GroupfolderFilesystemSnapshots\Manager;
+
+use OCP\IConfig;
+use OCP\Files\IRootFolder;
+use OCA\GroupFolders\Folder\FolderManager;
+
+class PathManager {
+    private IConfig $config;
+    private IRootFolder $rootFolder;
+    private FolderManager $groupfolderFolderManager;
+
+    const FILESYSTEM_ROOT_PATH = "/srv/nextcloud/files/";
+    const FILESYSTEM_SNAPSHOT_PATH = "/srv/nextcloud/files/.zfs/snapshot/";
+
+    public function __construct(IConfig $config, IRootFolder $rootFolder, FolderManager $manager){
+        $this->config = $config;
+        $this->groupfolderFolderManager = $manager;
+        $this->rootFolder = $rootFolder;
+    }
+
+    public function getFilesystemSnapshotPath() {
+        return self::FILESYSTEM_SNAPSHOT_PATH;
+    }
+
+    // Nextcloud general
+    public function getDataDirectory() {
+        return $this->config->getSystemValue("datadirectory");
+    }
+
+    private function getRootFolderStorageId(): ?int {
+		return $this->rootFolder->getMountPoint()->getNumericStorageId();
+	}
+
+    // Snapshots
+    public function getSnapshotPath(string $snapshotId) {
+        return realpath(self::FILESYSTEM_SNAPSHOT_PATH . DIRECTORY_SEPARATOR . $snapshotId . DIRECTORY_SEPARATOR);
+    }
+
+    public function convertToSnapshotPath(string $filesystemPath, string $snapshotId) {
+        $filesystemPath = realpath($filesystemPath);
+
+        if(!str_starts_with($filesystemPath, self::FILESYSTEM_ROOT_PATH)) {
+            return false;
+        }
+
+        return str_replace(self::FILESYSTEM_ROOT_PATH, $this->getSnapshotPath($snapshotId) . DIRECTORY_SEPARATOR, $filesystemPath);
+    }
+
+    // Groupfolders
+	private function checkIfGroupfolderExists(int $groupfolderId): bool {
+		$storageId = $this->getRootFolderStorageId();
+		if ($storageId === null) {
+			return "storage Id null";
+		}
+
+		$folder = $this->groupfolderFolderManager->getFolder($groupfolderId, $storageId);
+		if ($folder === false) {
+			return "Folder does not exist";
+		}
+        
+		return true;
+	}
+
+    public function getGroupFolderDirectory(int $groupfolderId) {
+        $folderExistsCheck = $this->checkIfGroupfolderExists($groupfolderId);
+		if(!$folderExistsCheck) {
+            return $folderExistsCheck;
+        }
+
+		return realpath($this->getDataDirectory() . DIRECTORY_SEPARATOR . "__groupfolders" . DIRECTORY_SEPARATOR . $groupfolderId . DIRECTORY_SEPARATOR);
+	}
+
+    public function getGroupFolderSnapshotDirectory(int $groupfolderId, string $snapshotId) {
+        return $this->convertToSnapshotPath($this->getGroupFolderDirectory($groupfolderId), $snapshotId);
+    }
+}
\ No newline at end of file
diff --git a/lib/Manager/SnapshotManager.php b/lib/Manager/SnapshotManager.php
index ef88bf3..b71fe5a 100644
--- a/lib/Manager/SnapshotManager.php
+++ b/lib/Manager/SnapshotManager.php
@@ -2,15 +2,55 @@
 
 namespace OCA\GroupfolderFilesystemSnapshots\Manager;
 
-class SnapshotManager {
-    function get() {
-        $filesystem_path = "/srv/nextcloud/files/";
-        $filesystem_snapshot_path = "/srv/nextcloud/files/.zfs/snapshot/";
+use OCA\GroupfolderFilesystemSnapshots\Manager\PathManager;
+use OCA\GroupfolderFilesystemSnapshots\Manager\DiffManager;
 
-        $iterator = new \FilesystemIterator($filesystem_snapshot_path);
-        foreach ($iterator as $fileinfo) {
-            if(!$fileinfo->isDir()) continue;
-            yield $fileinfo->getFilename();
+use OCA\GroupfolderFilesystemSnapshots\Entity\Snapshot;
+
+class SnapshotManager {
+    private PathManager $pathManager;
+    private DiffManager $diffManager;
+
+
+    public function __construct(PathManager $pathManager, DiffManager $diffManager){
+        $this->pathManager = $pathManager;
+        $this->diffManager = $diffManager;
+    }
+
+    private function validSnapshotId(string $snapshotId) {
+        return (preg_match("/^[a-zA-Z0-9-_]+$/", $snapshotId) == 1);
+    }
+
+    function snapshotExists(string $snapshotId): bool {
+        if($this->validSnapshotId($snapshotId)) {
+            $path = $this->pathManager->getSnapshotPath($snapshotId);
+            return (file_exists($path) && is_dir($path));
+        } else {
+            return false;
         }
     }
+
+    function get(string $snapshotId) {
+        if(self::snapshotExists($snapshotId)) {
+            return new Snapshot($snapshotId);
+        } else {
+            return false;
+        }
+        
+    }
+
+    function getAll() {
+        $iterator = new \FilesystemIterator($this->pathManager->getFilesystemSnapshotPath());
+        foreach ($iterator as $fileinfo) {
+            if(!$fileinfo->isDir()) continue;
+            yield new Snapshot($fileinfo->getFilename());
+        }
+    }
+
+    function getDiff(int $groupfolderId, string $snapshotId) {
+        $groupfolderPath = $this->pathManager->getGroupFolderDirectory($groupfolderId);
+        $snapshotPath = $this->pathManager->getGroupFolderSnapshotDirectory($groupfolderId, $snapshotId);
+
+        return $this->diffManager->diffDirectories($snapshotPath, $groupfolderPath);
+    }
 }
\ No newline at end of file
diff --git a/lib/Sections/SnapshotsSection.php b/lib/Sections/SnapshotsSection.php
new file mode 100644
index 0000000..ca5800e
--- /dev/null
+++ b/lib/Sections/SnapshotsSection.php
@@ -0,0 +1,32 @@
+<?php
+namespace OCA\GroupfolderFilesystemSnapshots\Sections;
+
+use OCP\IL10N;
+use OCP\IURLGenerator;
+use OCP\Settings\IIconSection;
+
+class SnapshotsSection implements IIconSection {
+    private IL10N $l;
+    private IURLGenerator $urlGenerator;
+
+    public function __construct(IL10N $l, IURLGenerator $urlGenerator) {
+        $this->l = $l;
+        $this->urlGenerator = $urlGenerator;
+    }
+
+    public function getIcon(): string {
+        return $this->urlGenerator->imagePath('core', 'actions/settings-dark.svg');
+    }
+
+    public function getID(): string {
+        return 'groupfolder_filesystem_snapshots';
+    }
+
+    public function getName(): string {
+        return $this->l->t('Groupfolder Filesystem Snapshots');
+    }
+
+    public function getPriority(): int {
+        return 98;
+    }
+}
\ No newline at end of file
diff --git a/lib/Settings/SnapshotsAdmin.php b/lib/Settings/SnapshotsAdmin.php
new file mode 100644
index 0000000..eeeedd2
--- /dev/null
+++ b/lib/Settings/SnapshotsAdmin.php
@@ -0,0 +1,33 @@
+<?php
+namespace OCA\GroupfolderFilesystemSnapshots\Settings;
+
+use OCP\AppFramework\Http\TemplateResponse;
+use OCP\IConfig;
+use OCP\Settings\ISettings;
+
+class SnapshotsAdmin implements ISettings {
+    private IConfig $config;
+
+    public function __construct(IConfig $config) {
+        $this->config = $config;
+    }
+
+    /**
+     * @return TemplateResponse
+     */
+    public function getForm() {
+        $parameters = [
+            'Filesystem Snapshots Path' => $this->config->getSystemValue('snapshots_path', true),
+        ];
+
+        return new TemplateResponse('settings', 'settings/admin', $parameters, '');
+    }
+
+    public function getSection() {
+        return 'groupfolder_filesystem_snapshots';
+    }
+
+    public function getPriority() {
+        return 10;
+    }
+}
\ No newline at end of file