Yeah, same boat here. Currently using the discounted small business version. Not sure what I'm going to do once that expires. I haven't decide whether it's worth the time investment to use something open source like https://github.com/gilbertchen/duplicacy with eg Backblaze B2, or if I'll just bite the bullet and pay the full $10/month for Crashplan SB.
After using the discounted small business version till this month I finally moved my backup to: restic [0] + B2.
It was really just a 30m job and I have a setup that backups 4 times a day and prunes etc twice a week. You might want to checkout their forum if you need any help. I had tried Borg and duplicity [1] too but found restic to be perfect for my need.
I also have Tarsnap[2] for the double backup of my most important data.
I moved to Duplicacy with paid Google Drive backing store. Very very happy. Unlimited storage with Linux client, and doesn't have the horrible resource consumption of Crashplan.
(I paid for Crashplan SB for a while but dropped it when it was unable to restore my data. Test your restores!)
