You should try XSIBackup, you can download it at: https://33hops.com/xsibackup-vmware-esxi-backup.html
UPDATE 2018-03-22: now XSIBackup free edition features deduplication and differential backup without any limitation. The Pro version offers post-backup data integrity certification by means of sha1 checksums and many other professional features.
We have a free version (the link above) and a commercial version called XSIBACKUP-PRO ( https://33hops.com/xsibackup-pro-vmware-esxi-backup.html )
The free version has no limitations and can backup to a datastore or to any SSH server using Rsync, by means of the Delta algorithm.
The Pro version offers advanced features, like deduplication over VMFS, instant differential backups (no checksum wait), raising events on backup end, support for Borg Backup backends, and much more.
- FREE: performs hot backups, so your VMs will always be available.
- FREE: it also performs cold backups, shutting down your VM prior to the backup and turns it on when the backup has finished.
- FREE: warm backups; shuts down the VM, takes a snapshot, switches it on and back up the guest.
- FREE: cron programmable.
- FREE: can automatically make room for your new backup in the backup device once it is full based on the full size of the device or a configurable space limit.
- FREE: it is capable of using Rsync to perform differential backups, mirrored to a second ESXI box or to a local datastore.
- FREE: can overwrite backups or create a new folder for each new backup.
- FREE: self capable, will run in the hypervisor without the need of additional hardware.
- FREE: it's totally free for personal and commercial use.
- FREE: works on the free version of the ESXi hypervisor.
- FREE: creates and uses it's own SSL key pair allowing to stablish trust relationships between different servers that will be preserved across reboots.
- FREE: super easy to install by just cutting and pasting an install script downloadable here: https://33hops.com/xsibackup-vmware-esxi-backup.html
- PRO: backup ESXi configuration.
- PRO: customize XSIBackup e-mail layout.
- PRO: control and backup 20 servers from one point.
- PRO: chain actions upon backup end, other backup jobs or external progs/ URLs.
- PRO: certify backups, compare data disks hashes upon backup completion.
- PRO: warm backups, maximum compatibility, minimum downtime.
- PRO: © OneDiff Technology, instant diff backups to DS & over IP.
- PRO: Borg Backup support, block level + compression de-duplication backend.
- PRO: © XSINAS, block-level deduplication backup device.
- PRO: © XSITools, block-level deduplication over VMFS.
You can find the man page at: http://33hops.com/xsibackup-help-man-page.html
And a lot of useful posts and how-tos at: http://33hops.com/blog-main.asp?lang=EN