Mail.ru Cloud

Mail.ru Cloud is a cloud storage provided by a Russian internet company Mail.Ru Group. The official desktop client is Disk-O:, available on Windows and Mac OS.

Currently it is recommended to disable 2FA on Mail.ru accounts intended for rclone until it gets eventually implemented.

Features highlights

  • Paths may be as deep as required, e.g. remote:directory/subdirectory
  • Files have a last modified time property, directories don't
  • Deleted files are by default moved to the trash
  • Files and directories can be shared via public links
  • Partial uploads or streaming are not supported, file size must be known before upload
  • Maximum file size is limited to 2G for a free account, unlimited for paid accounts
  • Storage keeps hash for all files and performs transparent deduplication, the hash algorithm is a modified SHA1
  • If a particular file is already present in storage, one can quickly submit file hash instead of long file upload (this optimization is supported by rclone)


Here is an example of making a mailru configuration.

First create a Mail.ru Cloud account and choose a tariff.

You will need to log in and create an app password for rclone. Rclone will not work with your normal username and password - it will give an error like oauth2: server response missing access_token.

  • Click on your user icon in the top right
  • Go to Security / "Пароль и безопасность"
  • Click password for apps / "Пароли для внешних приложений"
  • Add the password - give it a name - eg "rclone"
  • Copy the password and use this password below - your normal login password won't work.

Now run

rclone config

This will guide you through an interactive setup process:

No remotes found, make a new one?
n) New remote
s) Set configuration password
q) Quit config
n/s/q> n
name> remote
Type of storage to configure.
Type of storage to configure.
Enter a string value. Press Enter for the default ("").
Choose a number from below, or type in your own value
XX / Mail.ru Cloud
   \ "mailru"
Storage> mailru
User name (usually email)
Enter a string value. Press Enter for the default ("").
user> username@mail.ru

This must be an app password - rclone will not work with your normal
password. See the Configuration section in the docs for how to make an
app password.
y) Yes type in my own password
g) Generate random password
y/g> y
Enter the password:
Confirm the password:
Skip full upload if there is another file with same data hash.
This feature is called "speedup" or "put by hash". It is especially efficient
in case of generally available files like popular books, video or audio clips
Enter a boolean value (true or false). Press Enter for the default ("true").
Choose a number from below, or type in your own value
 1 / Enable
   \ "true"
 2 / Disable
   \ "false"
speedup_enable> 1
Edit advanced config? (y/n)
y) Yes
n) No
y/n> n
Remote config
type = mailru
user = username@mail.ru
pass = *** ENCRYPTED ***
speedup_enable = true
y) Yes this is OK
e) Edit this remote
d) Delete this remote
y/e/d> y

Configuration of this backend does not require a local web browser. You can use the configured backend as shown below:

See top level directories

rclone lsd remote:

Make a new directory

rclone mkdir remote:directory

List the contents of a directory

rclone ls remote:directory

Sync /home/local/directory to the remote path, deleting any excess files in the path.

rclone sync --interactive /home/local/directory remote:directory

Modified time

Files support a modification time attribute with up to 1 second precision. Directories do not have a modification time, which is shown as "Jan 1 1970".

Hash checksums

Hash sums use a custom Mail.ru algorithm based on SHA1. If file size is less than or equal to the SHA1 block size (20 bytes), its hash is simply its data right-padded with zero bytes. Hash sum of a larger file is computed as a SHA1 sum of the file data bytes concatenated with a decimal representation of the data length.

Emptying Trash

Removing a file or directory actually moves it to the trash, which is not visible to rclone but can be seen in a web browser. The trashed file still occupies part of total quota. If you wish to empty your trash and free some quota, you can use the rclone cleanup remote: command, which will permanently delete all your trashed files. This command does not take any path arguments.

Quota information

To view your current quota you can use the rclone about remote: command which will display your usage limit (quota) and the current usage.

Restricted filename characters

In addition to the default restricted characters set the following characters are also replaced:

Character Value Replacement
" 0x22
* 0x2A
: 0x3A
< 0x3C
> 0x3E
? 0x3F
\ 0x5C
| 0x7C

Invalid UTF-8 bytes will also be replaced, as they can't be used in JSON strings.

Standard options

Here are the Standard options specific to mailru (Mail.ru Cloud).


User name (usually email).


  • Config: user
  • Type: string
  • Required: true



This must be an app password - rclone will not work with your normal password. See the Configuration section in the docs for how to make an app password.

NB Input to this must be obscured - see rclone obscure.


  • Config: pass
  • Type: string
  • Required: true


Skip full upload if there is another file with same data hash.

This feature is called "speedup" or "put by hash". It is especially efficient in case of generally available files like popular books, video or audio clips, because files are searched by hash in all accounts of all mailru users. It is meaningless and ineffective if source file is unique or encrypted. Please note that rclone may need local memory and disk space to calculate content hash in advance and decide whether full upload is required. Also, if rclone does not know file size in advance (e.g. in case of streaming or partial uploads), it will not even try this optimization.


  • Config: speedup_enable
  • Type: bool
  • Default: true
  • Examples:
    • "true"
      • Enable
    • "false"
      • Disable

Advanced options

Here are the Advanced options specific to mailru (Mail.ru Cloud).


Comma separated list of file name patterns eligible for speedup (put by hash).

Patterns are case insensitive and can contain '*' or '?' meta characters.


  • Config: speedup_file_patterns
  • Type: string
  • Default: ".mkv,.avi,.mp4,.mp3,.zip,.gz,.rar,.pdf"
  • Examples:
    • ""
      • Empty list completely disables speedup (put by hash).
    • "*"
      • All files will be attempted for speedup.
    • ".mkv,.avi,.mp4,.mp3"
      • Only common audio/video files will be tried for put by hash.
    • ".zip,.gz,.rar,.pdf"
      • Only common archives or PDF books will be tried for speedup.


This option allows you to disable speedup (put by hash) for large files.

Reason is that preliminary hashing can exhaust your RAM or disk space.


  • Config: speedup_max_disk
  • Type: SizeSuffix
  • Default: 3Gi
  • Examples:
    • "0"
      • Completely disable speedup (put by hash).
    • "1G"
      • Files larger than 1Gb will be uploaded directly.
    • "3G"
      • Choose this option if you have less than 3Gb free on local disk.


Files larger than the size given below will always be hashed on disk.


  • Config: speedup_max_memory
  • Type: SizeSuffix
  • Default: 32Mi
  • Examples:
    • "0"
      • Preliminary hashing will always be done in a temporary disk location.
    • "32M"
      • Do not dedicate more than 32Mb RAM for preliminary hashing.
    • "256M"
      • You have at most 256Mb RAM free for hash calculations.


What should copy do if file checksum is mismatched or invalid.


  • Config: check_hash
  • Type: bool
  • Default: true
  • Examples:
    • "true"
      • Fail with error.
    • "false"
      • Ignore and continue.


HTTP user agent used internally by client.

Defaults to "rclone/VERSION" or "--user-agent" provided on command line.


  • Config: user_agent
  • Type: string
  • Required: false


Comma separated list of internal maintenance flags.

This option must not be used by an ordinary user. It is intended only to facilitate remote troubleshooting of backend issues. Strict meaning of flags is not documented and not guaranteed to persist between releases. Quirks will be removed when the backend grows stable. Supported quirks: atomicmkdir binlist unknowndirs


  • Config: quirks
  • Type: string
  • Required: false


The encoding for the backend.

See the encoding section in the overview for more info.


  • Config: encoding
  • Type: MultiEncoder
  • Default: Slash,LtGt,DoubleQuote,Colon,Question,Asterisk,Pipe,BackSlash,Del,Ctl,InvalidUtf8,Dot


File size limits depend on your account. A single file size is limited by 2G for a free account and unlimited for paid tariffs. Please refer to the Mail.ru site for the total uploaded size limits.

Note that Mailru is case insensitive so you can't have a file called "Hello.doc" and one called "hello.doc".