AWS EC2 Backup

So, I'm looking at a project to build a backup system in our AWS VPC to backup files and SQL DBs. I'd like to use S3 storage to reduce storage costs, but local drives on the BU server is fine too. Rather than reinvent the wheel I wanted to see if anybody else is doing this.

The basic concept I've come up with is this:

1. CentOS with s3fs for mounting S3 buckets in the filesystem.
2. Bacula as the backup software (no licensing).
3. Assuming using S3 buckets isn't feasible going with local volumes and Gluster or rsync to keep a copy of the backup file remotely.
4. Batch scripts to run MSSQL backups (Full, Diff and Log) that Bacula calls then backs up the resulting file.

Anybody else do something along this line? Remember, it has to run in our AWS VPC to backup servers there.