TL;DR CloudBerry Windows $25, Linux $15 with code WBD2019
I'm currently running CloudBerry in free mode, was going to purchase the software anyway, but it happens to be a better deal than usual today. I know it has been free in the past, but I didn't snap it up then. This software is such a simple method to integrate backups onto many different mediums/services. I store to a local unraid server and to B2.
* World Backup Day is March 31st and we would like to celebrate this day with you. You have a great opportunity to save not only data but money. Starting from March 27th, 2019 and up to April 3rd, 2019 you can get CloudBerry Backup Desktop PRO for 50% off!
I had to follow an initial referring link to get the code, but I tried it on my current CloudBerry address as well as an address I've never used for CB and it worked on both. I assume the code is universal, but could be wrong.