Neal Becker wrote: I think this may be all I need: sudo mount /dev/sda3 /mnt [nbecker@nbecker2 ~]$ ls -l /mnt total 0 drwxr-xr-x. 1 root root 14 Jun 1 18:46 home dr-xr-xr-x. 1 root root 172 Jun 2 09:39 root [nbecker@nbecker2 ~]$ sudo btrfs sub snap /mnt/root /mnt/root-f21 Create a snapshot of '/mnt/root' in '/mnt/root-f21' [nbecker@nbecker2 ~]$ ls -l /mnt total 0 drwxr-xr-x. 1 root root 14 Jun 1 18:46 home dr-xr-xr-x. 1 root root 172 Jun 2 09:39 root dr-xr-xr-x. 1 root root 172 Jun 2 09:39 root-f21 So now I have a snap of f21 root in in root-f21 subvol, and I should be able to rollback by editing grub.cfg and /etc/fstab to point to root-f21 subvol instead of root subvol, correct? -- Those who fail to understand recursion are doomed to repeat it

Il giorno mar, 02/06/2015 alle 13.22 -0400, Neal Becker ha scritto: Curiosity, how do you know that f22 work worse respect f21, unless you do not try it for a while? For example, if you want to try Evolution (or some other local application with local data), you must download your mail, and you will try to write a message to send, just so you can discover that the editor of evolution is worse than the previous, and when you use undo (ctrl + z) undo does not do "undo" but something else and dirty your text (this, unfortunately, is a real problem that happens even now as I write this message). At that point, if you do a revert to f21, you lose all messages that you have downloaded and all work that you have done in the meantime on your machine. At this point it is too late. In short, I do not think that you can find all regression, that invariably occur when you change a version of Fedora (or Nautilus, or Evolution, or some Gnome Applications), in just a few minutes of test and decide to come back. Probably is better test the new version on a simple virtual machine ... or not? Thanks for your attention. -- Dario Lesca (inviato dal mio Linux Fedora 22 con Gnome 3.16)

On Tue, 2015-06-02 at 23:33 +0200, Dario Lesca wrote: If your mail is handled through an IMAP server (rather than POP), then this wouldn't be the case. Your mails are stored on the server, and your mail program browses them. If you want to test a mail client, or have to put up with continually replacing your OS installation, it's the best way to go about it. As for the rest of your work, there are various ways of dealing with that. There's the backup and restore technique. Or, keep /home as a separate partition, so that you can re-install around it (still make a backup though, just hope you're lucky enough to not have to make use of it). Or you can keep your files in a separate server, which could be another computer, or just a networked drive. These days, it's next to impossible to get by with just one computer. You almost need another one so you can research, on-line, how to fix up the other one when it goes doolally. If you're in that position, you may as well install a long-lived distro on one, and use it as your server. -- tim@localhost ~]$ uname -rsvp Linux 3.19.8-100.fc20.i686 #1 SMP Tue May 12 17:42:35 UTC 2015 i686 All mail to my mailbox is automatically deleted, there is no point trying to privately email me, I will only read messages posted to the public lists. George Orwell's '1984' was supposed to be a warning against tyranny, not a set of instructions for supposedly democratic governments.