I wrote virtsync, an alternative to rsync, which performs much better on sparse, GB+ files that don't change much (like VM disk images). http://www.virtsync.co

I wrote virtsync, an alternative to rsync, which performs much better on sparse, GB+ files that don't change much (like VM disk images). http://www.virtsync.com http://www.virtsync.com It's a niche product that makes me $1-2K per year. More importantly, virtsync customers have hired me for other jobs.