SquirrelSave is described as 'UK's #1 Online Backup & Data Backup solution. Unlimited, continuous backups of your laptop/PC. Simple, secure & includes free historical forever. Watch the demo now!' and is an app in the Backup & Sync category. There are more than 10 alternatives to SquirrelSave for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Duplicati, which is both free and Open Source. Other great apps like SquirrelSave are Spideroak One Backup (Paid), BackBlaze (Paid), Déjà Dup (Free, Open Source) and Time Machine (Free).
Duplicati is a backup client that securely stores encrypted, incremental, compressed backups on local storage, cloud storage services and remote file servers. The Duplicati project was inspired by Duplicity and had similar functionality until 2008.
SpiderOak provides an easy, secure and consolidated online backup, storage, access, sharing & sync tool for Windows, macOS, and Linux (Ubuntu, Debian & Fedora). SpiderOak offers a different approach to online backup, synchronization, and sharing.
Online backup for $7 month unlimited space. Backblaze backup encrypts and uploads all your data – no questions asked. No picking files. No digging through folders. Your data is backed up online to our datacenters, so nothing can touch it.
Time Machine is the breakthrough automatic backup that’s built right into Mac OS X. It keeps an up-to-date copy of everything on your Mac — digital photos, music, movies, TV shows, and documents. Now, if you ever have the need, you can easily go back in time to recover anything.
rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago.