Applicable Products
Hybrid Backup Sync
Details
Different cloud service providers may have different restrictions and limitations on what files can be uploaded to their servers. The following are some common limitations, followed by specific limitations on several popular cloud services listed in alphabetical order.
Common Limitations
- Speed limits are imposed by the cloud storage provider.
- Upload and download file size limitations are imposed by the cloud storage provider.
- File and folder names that do not meet the cloud storage provider’s requirements will be skipped or removed.
- File and folder names ending with a period (.) or space ( ), or that differ only in capitalization may not be supported.
For example, the cloud storage provider may consider “data” and “DATA” to be the same.Note
For details, see individual sections below for each cloud storage provider, or refer to your provider’s documentation.
- For syncing from the cloud to your QNAP NAS, note that the NAS has character limitations also.
- If you rename a folder during an ongoing RTRR sync job, files within the folder may be removed.
Tip
You can use snapshots to mitigate this limitation.
- Only RTRR sync jobs support partial file updates.
For all other types of sync jobs, the entire file is transferred again every time the file is modified, even if the modification is only partial. - Backing up or syncing mounted or external shared folders is not supported.
- For backing up or syncing data on an external storage device connected to your NAS, we recommend using the EXT4 file system on the external storage device for best compatibility.
Box
- To ensure best performance, you can sync up to 100,000 files and up to 100 GB in total size for all files.
- Box recommends syncing only the folders that you are actively working in.
Dropbox
- The names of files and folders cannot exceed 255 characters.
- Dropbox does not allow the characters / \ < > : " | ? * in the path name, and the following files cannot be uploaded to Dropbox:
- System files: desktop.ini, thumbs.db, .ds_store, icon, .dropbox, .dropbox.attr
- Temporary files
- Files or folders that include trailing spaces.
- Both the Dropbox cloud web console and client app are case-sensitive and do not support having identical file names with different capitalization.
Google Drive
- The size of individual files cannot exceed 5 TB.
- Both the Google Drive web console and Android app supports capital and lowercase file names, but the client app for macOS and iOS does not.
OneDrive
- File names and folder names cannot exceed 256 bytes. The length of the full path must also be less than 430 bytes.
- OneDrive does not allow the characters / \ * < > ? : | in the path name. File names cannot contain leading spaces, trailing spaces, or end with a period (.). Folder names also cannot end with a period (.)
- The size of individual files cannot exceed 10 GB.
- Both OneDrive web console and client app are case-sensitive and do not support having identical file names with different capitalization.
OneDrive for Business
- Folder name and file name combinations cannot exceed 250 characters.
- OneDrive for Business does not allow the invalid characters \ / : * ? " < > | # %. Additionally, a file or folder name that begins with a tilde (~) is not supported.
- The following are illegal file names:
*_files, *_Dateien, *_fichiers, *_bestanden, *_file, *_archivos, *_tiedostot, *_pliki, *_soubory, *_elemei, *_ficheiros, *_arquivo, *_dosyalar, *_datoteke, *_fitxers, *_failid, *_fails, *_bylos, *_fajlovi, *_fitxategiak, *_private - You cannot upload files that have a .tmp or .ds_store extension, and you cannot upload desktop.ini, thumbs.db, or ehthumbs.db files.
- The size of individual files cannot exceed 2 GB.
- You can sync up to 20,000 total items across all synchronized libraries. This includes folders and files.
For the most complete and up-to-date list of restrictions and limitations, please consult your cloud service provider’s official documentation.
Further Reading
Why can’t I upload files with file names of more than 83 Chinese characters (or more than a certain number of other characters)?
适用产品
Hybrid Backup Sync
详情
不同的云服务提供商可能对上传到其服务器的文件有不同的限制和限制。以下是一些常见的限制，接下来是按字母顺序列出的几个流行云服务的具体限制。
常见限制
- 云存储提供商会对速度进行限制。
- 云存储提供商会对上传和下载文件大小进行限制。
- 不符合云存储提供商要求的文件和文件夹名称将被跳过或移除。
- 以句号（.）或空格（）结尾的文件和文件夹名称，或仅在大小写上有所不同的名称可能不被支持。
例如，云存储提供商可能会将“data”和“DATA”视为相同。注意
详情请参阅下文中各云存储提供商的单独章节，或参考您的提供商文档。
- 从云同步到您的 QNAP NAS 时，请注意 NAS 也有字符限制。
- 如果在进行中的 RTRR 同步任务中重命名文件夹，文件夹中的文件可能会被移除。
- 只有 RTRR 同步任务支持部分文件更新。
对于所有其他类型的同步任务，每次文件修改时，即使修改仅为部分，整个文件也会再次传输。 - 不支持备份或同步已挂载或外部共享文件夹。
- 对于连接到您的 NAS 的外部存储设备上的数据备份或同步，我们建议在外部存储设备上使用 EXT4 文件系统以获得最佳兼容性。
Box
- 为了确保良好的性能，您可以同步最多 100,000 个文件，总大小最多为 100 GB。
- Box 建议仅同步您正在积极处理的文件夹。
Dropbox
- 文件和文件夹的名称不能超过 255 个字符。
- Dropbox 不允许路径名称中包含字符 / \ < > : " | ? *，以下文件不能上传到 Dropbox：
- 系统文件：desktop.ini, thumbs.db, .ds_store, icon, .dropbox, .dropbox.attr
- 临时文件
- 重要
文件名以“~$”或“ .~”开头。
- 文件名以“~”开头并以“.tmp”结尾。
- 包含尾随空格的文件或文件夹。
- Dropbox 云端网页控制台和客户端应用程序区分大小写，不支持具有不同大小写的相同文件名。
Google Drive
- 单个文件的大小不能超过 5 TB。
- Google Drive 网页控制台和 Android 应用程序支持大写和小写文件名，但 macOS 和 iOS 的客户端应用程序不支持。
OneDrive
- 文件名和文件夹名不能超过 256 字节。完整路径的长度也必须小于 430 字节。
- OneDrive 不允许路径名中包含字符 / \ * <> ? : | 。文件名不能包含前导空格、尾随空格或以句号 (.) 结尾。文件夹名也不能以句号 (.) 结尾。
- 单个文件的大小不能超过 10 GB。
- OneDrive 网页控制台和客户端应用程序区分大小写，不支持具有不同大小写的相同文件名。
OneDrive for Business
- 文件夹名和文件名的组合不能超过 250 个字符。
- OneDrive for Business 不允许无效字符 \ / : * ? " <> | # %。此外，不支持以波浪号 (~) 开头的文件或文件夹名。
- 以下是非法文件名：
*_files, *_Dateien, *_fichiers, *_bestanden, *_file, *_archivos, *_tiedostot, *_pliki, *_soubory, *_elemei, *_ficheiros, *_arquivo, *_dosyalar, *_datoteke, *_fitxers, *_failid, *_fails, *_bylos, *_fajlovi, *_fitxategiak, *_private - 您不能上传扩展名为.tmp 或.ds_store 的文件，也不能上传 desktop.ini、thumbs.db 或 ehthumbs.db 文件。
- 单个文件的大小不能超过 2 GB。
- 您可以在所有同步的库中同步最多 20,000 个项目。这包括文件夹和文件。
有关最完整和最新的限制和限制列表，请查阅您的云服务提供商的官方文档。
进一步阅读
为什么我不能上传文件名超过 83 个汉字（或超过一定数量的其他字符）的文件？
