[tex-live] create/restore a backup snapshot

[kap4lin]

How do I restore the backup/snapshot taken before an update? Consider
the following seq:

tlmgr backup --clean=3 --backupdir $SOMEDIR --all
tlmgr update --self
tlmgr update --all

Now, reading the manual:

restore --backupdir dir  [pkg [rev]]
Restore a package from a previously-made backup.
If neither pkg nor rev are given, list the available backup revisions
for all packages.
With pkg given but no rev, list all available backup revisions of pkg.
With both pkg and rev, tries to restore the package from the specified backup

If I understand correctly, one can restore only individual packages
and not the entire snapshot? Well, I could create separate backupdir
for each snapshot and then restore from there. Is that the right way?

-- 
Regards
Kap4Lin
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http://counter.li.org  #402424