If it's open-source, Linux support is only a few hours with Claude away.
If it's not open-source, but the protocol is documented, see above.
If it's not open-source, and the protocol isn't documented, well... that makes the decision easy, doesn't it?
Backups software written by Claude? No thanks.
I've used enough Claude coded applications that I wouldn't trust that with a backup, unless it had extensive tests along with it.