Backup & Sync
In life, things happen. It’s the nature of the beast. Fires, floods, robbery, and other disasters that can rob you of data occur with some amount of regularity. This means that it’s critical to have a backup or contingency plan in order to pick up where you left off the best you can in case the worst case occurs. That’s where software focused on backing up and synchronizing your data comes in.
Software that focuses on backing up physical media, local hard drive data, and even critical messages and other forms of communication is the focus here, alongside services such as DropBox and OneDrive that focus on constantly syncing data between your devices and secure external servers that you can access from anywhere with an Internet connection.
Most popular apps

Joplin
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.

Dropbox
Put your files into your Dropbox on one computer, and they'll be instantly available on any of your other computers that also have Dropbox installed. Because copies of your files are stored on Dropbox's secure servers, you can also access them from any computer or mobile...

Google Drive
Google Drive is a file storage and synchronization service which enables user cloud storage, file sharing and collaborative editing.

Rescuezilla
Rescuezilla is a free, easy-to-use hard drive disk cloning and imaging application that boots as a live USB. Rescuezilla is fully interoperable with Clonezilla . This means that backups created by Clonezilla can be restored with Rescuezilla...

Syncthing
Syncthing replaces proprietary sync and cloud services with something open, trustworthy and decentralized. Your data is your data alone and you deserve to choose where it is stored.

MEGA
MEGA, the successor of MegaUpload , is a cloud storage and file hosting service produced by Mega Limited. This cloud-storage solution claims to protect your privacy with end-to-end encryption and offers a "Secure Collaboration"...

GParted
GParted is a GTK+ frontend to GNU Parted and the official GNOME Partition Editor application. It is used for creating, deleting, resizing, moving, checking and copying partitions, and the file systems on them.

FreeFileSync
FreeFileSync is a folder comparison and synchronization software that creates and manages backup copies of all your important files. Instead of copying every file every time, FreeFileSync determines the differences between a source and a target folder and transfers only the...