What's the risk using Systemback ?

[Valtam]

1. That is unknown. We'll have to wait for the Dev to inform us. Series 4.x won't be released until June 2018 so there is a ton of time left. No panic. Series 3.x should be fine, but it is something we will certainly keep an eye on.
2. Not that I'm aware of.
3. There will be software on your computer now that is less updated and maintained than Systemback. I have already said in the Forums that if Systemback does not offer official support for 18.04 it won't be included in Series 4.x

If there is any major news, I'll be sure to report it.