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README.md

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+# cloud Backup
+Application that allows users
+to backup the contents of a specified local directory using a cloud service.
+Made of backup server (bs folder) central server (cs folder) and client(user.py) in python using tcp/udp.
+
+To perform any cloud backup operation the user first needs to authenticate itself. For
+this, the user application establishes a TCP session with the CS, which has a wellknown URL, providing the user identity
+and a password (composed of 8 alphanumerical characters, restricted to letters and
+numbers). The CS will confirm the authentication.
+The user can then decide to perform one of the operations:
+1 – Register as a new user.
+2 – Request the backup of a selected local directory.
+3 – List the previously stored directories and files.
+4 – Retrieve a previously backed up directory.
+5 – Delete the backup for a selected directory.
+6 – Delete the registration as a user.
+The directories to be backed up should be contained in the current directory from where
+the user program was invoked, and they should not contain subdirectories. File and
+directory names should not contain spaces and should have less than 20 characters. In
+the current directory there should be at most 20 directories, each one with a maximum
+of 20 files.
+When requesting the backup of a local directory the user application sends to the CS a
+backup request message indicating: the directory name and the number and list of files
+to be backed up (with name, date, time, size).
+
+To retrieve the files from a previous backup, the user application contacts the CS,
+sending the name of the directory being retrieved. The CS checks which BS contains the
+backup and returns the corresponding IP and TCP port. The user application then closes
+the TCP connection with the CS and automatically establishes a new TCP session with
+the BS, to retrieve the files, after authentication.
+
+![Alt Text](https://i.ibb.co/m5LBt8q/image-2019-07-03-20-00-05.png)
+