When comparing duplicity vs Mega, the Slant community recommends Mega for most people. In the question“What are the best personal file-syncing solutions?” Mega is ranked 9th while duplicity is ranked 15th. The most important reason people chose Mega is:
Linux, Windows and Mac.
Ranked in these QuestionsQuestion Ranking
Pro Free and open-source
Licensed under GNU GPL v2.
Pro Encrypted locally before sending (using GnuPG)
Data is encrypted locally before being sent, and kept encrypted by a key that is never stored on the remote machine. So you might even store your data on a public space, people would still need your key or brute force it.
Pro Bandwidth and space efficient
Duplicity uses the rsync algorithm so only the changed parts of files are sent to the archive when doing an incremental backup. For instance, if a long log file increases by just a few lines of text, a small diff will be sent to and saved in the archive. Other backup programs may save a complete copy of the file.
Pro Versioning and incremental backup
You can retrieve older versions or files you recently deleted locally even after having updated your backup.
Pro Works with scp/ssh, ftp, rsync, Amazon S3...
Duplicity does not make many demands on its archive server. As long as files can be saved to, read from, listed, and deleted from a location, that location can be used as a duplicity backend. Besides increasing choice for the user, it can make a server more secure, as clients only require minimal access.
Pro Has a Dockerized image
Docker allows to run programs on any Linux without having to really install them, and allows to manage versions so it runs exactly the same on different machines.
Pro Cross platform
Linux, Windows and Mac.
Pro Client-side encryption
All files uploaded to Mega are first encrypted on the users side. To access files a decryption key must be supplied. For ease of use, the decryption key can be appended to the URL you share.
Pro 50GB free
There's also three upgrade plans, starting at 500GB and $110/yr.
Pro Easy to use
Just drag and drop files in the browser window, then create a link for sharing. You will need an account to create a link. To streamline the process for new users you can start uploading as soon as you access the website and create an account while it's uploading.
Pro Open source client
Pro Functional web interface
Con You have to invest a few minutes in setup time
Con No account recovery
The only way to access your account is with a password and there is no way to recover it if you lose it.
Con Higher than normal chance of a forced service shutdown
Mega has a higher than normal chance of having legal troubles due its founders past, thus there's a higher than normal chance that the service may be shut down with all your files in it and no way to retrieve them.