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Groups > linux.debian.user > #262026

btrfs snapshots (of root file system)?

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Hi,

with btrfs, how do I make a snapshot of the root file system?  The
purpose is to update software and being able to go back to a previous
state if necessary.

There doesn't seem to be a command to create snapshots but only
subvolumes?  How does a subvolume turn into a snapshot?  (The root
file system is, of course, not on a subvolume.)

How do I merge snapshots?  IIRC, when you remove a ZFS snapshot, the
older state is merged to the state the snapshot is in.  Apparently
btrfs can only delete snapshots --- and it seems like a bad idea to
delete the root file system.  How would I boot from it when it's been
deleted?

Can I make a snapshot on a different volume?  The manpage doesn't say
that the destination of a subvolume must be on the same volume, and in
any case, I should be able to do that.

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btrfs snapshots (of root file system)? hw <hw@adminart.net> - 2023-10-01 02:40 +0200
  Re: btrfs snapshots (of root file system)? debian-user@howorth.org.uk - 2023-10-01 12:00 +0200
    Re: btrfs snapshots (of root file system)? hw <hw@adminart.net> - 2023-10-01 21:30 +0200
  Fwd: btrfs snapshots (of root file system)? Keith Bainbridge <keithrbau@gmail.com> - 2023-10-02 11:40 +0200
  Re: btrfs snapshots (of root file system)? Keith Bainbridge <keithrbau@gmail.com> - 2023-10-02 11:40 +0200
  Re: btrfs snapshots (of root file system)? Anders Andersson <pipatron@gmail.com> - 2023-10-02 21:40 +0200
    Re: btrfs snapshots (of root file system)? hw <hw@adminart.net> - 2023-10-04 21:40 +0200

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