diff --git a/client/api/reader.js b/client/api/reader.js
index d0f97622..1cf1339e 100644
--- a/client/api/reader.js
+++ b/client/api/reader.js
@@ -229,6 +229,17 @@ class Reader {
         return (await axios.get(url)).data;
     }
 
+    async checkBuc(bookUrls) {
+        const response = await wsc.message(await wsc.send({action: 'check-buc', bookUrls}));
+
+        if (response.error)
+            throw new Error(response.error);
+
+        if (!response.data)
+            throw new Error(`response.data is empty`);
+
+        return response.data;
+    }
 }
 
 export default new Reader();
\ No newline at end of file
diff --git a/client/components/Reader/share/bookManager.js b/client/components/Reader/share/bookManager.js
index e3aca138..f8f9fdde 100644
--- a/client/components/Reader/share/bookManager.js
+++ b/client/components/Reader/share/bookManager.js
@@ -234,6 +234,10 @@ class BookManager {
 
     async addBook(newBook, callback) {        
         let meta = {url: newBook.url, path: newBook.path};
+
+        if (newBook.downloadSize !== undefined && newBook.downloadSize >= 0)
+            meta.downloadSize = newBook.downloadSize;
+        
         meta.key = this.keyFromPath(meta.path);
         meta.addTime = Date.now();//время добавления в кеш
 
diff --git a/server/core/BookUpdateChecker/BUCClient.js b/server/core/BookUpdateChecker/BUCClient.js
index 02c1882b..099cb9fe 100644
--- a/server/core/BookUpdateChecker/BUCClient.js
+++ b/server/core/BookUpdateChecker/BUCClient.js
@@ -28,7 +28,7 @@ class BUCClient {
                 this.cleanQueryInterval = 300*dayMs;//интервал очистки устаревших
                 this.syncPeriod = 1*hourMs;//период синхронизации с сервером BUC
             } else {
-                this.cleanQueryInterval = 300*minuteMs;//300*dayMs;//интервал очистки устаревших
+                this.cleanQueryInterval = 300*dayMs;//интервал очистки устаревших
                 this.syncPeriod = 1*minuteMs;//период синхронизации с сервером BUC
             }
 
diff --git a/server/core/Reader/ReaderWorker.js b/server/core/Reader/ReaderWorker.js
index 25485b95..340c4f90 100644
--- a/server/core/Reader/ReaderWorker.js
+++ b/server/core/Reader/ReaderWorker.js
@@ -105,6 +105,7 @@ class ReaderWorker {
             const tempFilename2 = utils.randomHexString(30);
             const decompDirname = utils.randomHexString(30);
 
+            let downloadSize = -1;
             //download or use uploaded
             if (url.indexOf('disk://') != 0) {//download
                 const downdata = await this.down.load(url, (progress) => {
@@ -112,6 +113,8 @@ class ReaderWorker {
                 }, q.abort);
 
                 downloadedFilename = `${this.config.tempDownloadDir}/${tempFilename}`;
+
+                downloadSize = downdata.length;
                 await fs.writeFile(downloadedFilename, downdata);
             } else {//uploaded file
                 const fileHash = url.substr(7);
@@ -166,7 +169,12 @@ class ReaderWorker {
 
             //finish
             const finishFilename = path.basename(compFilename);
-            wState.finish({path: `/tmp/${finishFilename}`, size: stat.size});
+
+            const result = {path: `/tmp/${finishFilename}`, size: stat.size};
+            if (downloadSize >= 0)
+                result.downloadSize = downloadSize;
+
+            wState.finish(result);
 
             //асинхронно через 30 сек добавим в очередь на отправку
             //т.к. gzipFileIfNotExists может переупаковать файл