Incremental Backup of repositories using Git

Hi,

Currently we are backing up repositories using the "git clone -bare" command and save it to disk. If we want to restore, we just run git push -mirror from the repo that was saved during the backup.

Currently we are running full backups (run git clone -bare) everyday, which is taking a lot of disk space and time.

Are there any possible ways to backup only the incremental changes of a repository? And somehow construct the whole repository when we want to do a restore from the incremental backups?

Thanks, Akash