I was using it at the time and had to find an alternative, which I never really did. I tried restic and similar programs, but they were all too slow finding what changed. The key to Crashplan was that it monitored the filesystem for changes, so it didn't have to do an expensive traversal.

In the end I settled for just using the daily full-image backups I was already taking and forego the <15min backup points I had with Crashplan.

Been missing it a few times, but overall surviving without.

[1]: https://www.theverge.com/2017/8/22/16184430/crashplan-home-s...