Revision 367436

Add a periodic script to backup output generated from `zfs list`, `zfs get`,
`zpool list`, and `zpool get` commands.

Disabled by default.

PR:             86388
Submitted by:   Miroslav Lachman <000.fbsd@quip.cz>
Reviewed by:    allanjude, 0mp
Approved by:    allanjude (mentor)
MFC after:      4 weeks
Event:          July 2020 Bugathon
Differential Revision:  https://reviews.freebsd.org/D25638