Backup improvements

[gotlium]

Hi, can you add new functionality to backup system. I think it will be wondering, if admin can set how much backup on day, or on week is needed. If backup script can work over LLVM, vm idle will be less and minor. What you think about this? It's real or you do not have a time, to do this? I'm use Python, and I can't contribute to this project. It's a very sad:(

p.s. - if it's possible, you can add settings to remote backups(via nfs, ftp or sftp). And max allowed size. When limit is reached, old backups will be removed.