Add bzfs to Backups section

[whoschek]

Thank you for taking the time to work on a PR for Awesome-Sysadmin!

To ensure your PR is dealt with swiftly please check the following:

• Your additions are Free software
• Software you are submitting is not your own, unless you have a healthy ecosystem with a few contributors (which aren't your sock puppet accounts).
• Submit one item per pull request. This eases reviewing and speeds up inclusion.
• Format your submission as follows, where Demo and Clients are optional.
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• Additions are not already listed at awesome-selfhosted
• The Language tag is the main server-side requirement for the software. Don't include frameworks or specific dialects.
• You have searched the repository for any relevant issues or PRs, including closed ones.
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• Any software project you are adding to the list is actively maintained.
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Please take some time to answer the following questions as best you can:

• Why is it awesome?

bzfs replicates snapshots from many local or remote source ZFS datasets (and their descendants) to local or remote destination datasets, using zfs send/receive and ssh, and can operate at sub-second intervals across large fleets of hosts for DR/HA.

• Have you used it? For how long?

Yes, for more than 2 years.

• Is this in a personal or professional setup?

This is engineered for reliability at high scale in professional setups. Can also easily be used in personal setups.

• How many devices/users/services/... do you manage with it?

Dozens of hosts.

• Biggest pros/cons compared to other solutions?

Some scripting skills are helpful to get the most out of this software.

• Any other comments about your use case, things you've found excellent, limitations you've encountered... ?

Strong support for disaster recovery and high availability (DR/HA), scale-out deployments, and protection against data loss or ransomware.

[Technetium1]

This will require some users to vouch for it in my opinion, but I appreciate the active development and think it's a cool project. https://github.com/whoschek/bzfs/graphs/contributors