Arq 4.1

Arq is the only online backup product built for the Mac and only the Mac. So it has the look and feel you expect from a Mac application. Arq backs up and faithfully restores all the special metadata of Mac files that other products don't, including resource forks, ACLs, and creator codes. Arq works like Time Machine, except you don't have to remember to plug in your external hard drive. Following the initial backup, Arq automatically makes incremental backups every hour, every day, uploading just the files that have changed since your last backup. Arq keeps hourly backups for the past 24 hours, daily backups for the past month, and weekly backups for everything older than a month. Arq lets you set a budget for S3 storage, and it automatically drops the oldest backups to keep within the budget. Arq backs up everything with no limits. It backs up files of any size, external drives, and network drives. Arq "de-duplicates" your backups, never storing the same file twice in your S3 account.
What's new in this version:
Fixed an issue that would cause massive RAM usage if configured to back up "/". Fixed a crash that occurs if the SFTP server fails to return a user auth list. Fixed an issue where Amazon Cloud Drive returns a 400 status code with JSON response showing statusCode:404 instead of a 404 status code.