When comparing bup vs CrashPlan, the Slant community recommends bup for most people. In the question“What are the best backup programs for Linux?” bup is ranked 11th while CrashPlan is ranked 14th. The most important reason people chose bup is:
Data is shared between different incremental backups without having to know which backup is based on which. Even for backups that come from different computers that know nothing about each other. Bup simply saves the minimal amount of data needed.
Specs
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Pros
Pro Saves only the minimum amount of data needed
Data is shared between different incremental backups without having to know which backup is based on which. Even for backups that come from different computers that know nothing about each other. Bup simply saves the minimal amount of data needed.
Pro Huge files can be backed up incrementally
Bup splits up files into different chunks. This is especially useful for large files which can then be stored without using a lot of disk space for different versions of the same file.
Pro Unintrusive
You set it up once and from then it runs in the background whenever you are not using your computers (or at specified times).
Pro Supports multiple backup destinations
You can set up different files/folders to back up to specific places.
Pro Differential and incremental file backup
CrashPlan updates only that part of the file that has changed, saving bandwidth and time.
Pro Unlimited online storage
The $5/mo individual plan and the $12.50/mo family plan gets you unlimited cloud storage.
Pro Allows custom encryption keys
Custom 448 bit user-provided encryption key can be used to encrypt the backed up data in the cloud.
Pro Users can order a physical copy of their data
They will send you an external hard drive to your house.
Pro Unlimited revision history
CrashPlan saves all previous versions of a file.
Cons
Con No GUI
Only available as a command line tool.
Con Buggy
Con Home edition discontinued
CrashPlan's home edition will be shut down on October 23, 2018. They are no longer accepting new signups or subscription renewals.
Con Popular features (local backup and trusted offsite backup) no longer available
Con Heavy client
The BackupClient is based on Java and therefore a lot more memory-intensive than most other backup solutions