InnoDB Weekly Backups

Hi All,

We need to implement a backup solution for our innodb tables (~50gigs)
that:

1) Runs automatically, weekly, and in the background w/o interrupting
normal usage
2) Is capable of restoring individual tables
3) Can backup across networked computers

I've searched and found a few options: InnoDB Hot Backup ($510/year),
PeerSync ($899/perp), and Servosity Remote data backup (~$350/month).

Does anyone have any experiences or suggestions about other solutions
or the ones above?

Thanks, Chad