Downloading Arq 7.22 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. Arq.zip is the most common filename for this application's installer.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. Arq for Mac lies within System Tools, more precisely Backup & Restore. The following versions: 4.7, 2.8 and 1.7 were the most frequently downloaded ones by the program users. The actual developer of this Mac application is Haystack Software LLC.
From the developer:
Arq backs up all your computers. Your files are stored securely, readable only by you.
The app keeps multiple versions of your files — a backup history. So if you discover a file was corrupted or accidentally deleted, you can go back and get the old version.
Arq also back up external hard drives, NAS files, whatever you want.
The program stores your encrypted backups in a format that's open and documented.
You may want to check out more Mac applications, such as Fldigi, which might be similar to Arq.