MEGAsync

MEGAsync connects a Windows PC to a MEGA cloud account. Its main job is two-way synchronisation: you pair a local folder with a folder in your MEGA Cloud Drive, and the client keeps both sides matching. Files added, renamed, moved or deleted on the computer are reflected in the cloud, and changes made through the web interface or another device are applied back to the local folder. Several folder pairs can be configured independently, so you can sync only the directories you care about instead of one large container folder.

Alongside sync, the client offers a separate backup mode that copies selected local folders into the cloud in one direction only, which suits archiving material you do not want an accidental local deletion to remove from the cloud. Transfers are handled by a background service with a queue you can pause, resume and bandwidth-limit, and the app adds an Explorer context menu for uploading files and generating share links without opening the web client. Files are encrypted on the device before upload, so MEGA stores content it cannot read; the flip side is that losing your password and recovery key can mean losing access to the data.

The program is useful if MEGA is already your cloud provider and you want folders kept current without manual uploading, or if you want a low-effort cloud copy of a working directory. It is less useful as a general backup tool: there is no versioned image or disk-level backup, no scheduling beyond continuous operation, and the free storage allowance is modest compared with a local backup drive. It is also not a standalone product, since everything it does depends on a MEGA account and the storage and transfer quota attached to it.

The client itself is a free download for Windows, macOS and Linux, and MEGA publishes its source code on GitHub, though under the company's own review licence rather than a standard open source one.