I have been trying to understand how snapshots work (in BRTFS and in
general), but I still have some questions, and would appreciate if
someone could clear them for me.
To make things easier, I tried to make most of them Yes/No questions:
1. When creating the filesystem, I only made btrfs partition with no
subvolumes. Do I have to use subvolumes, or can I snapshot entire “/“?
2. Can I take a snapshot of a working / root filesystem?
3. If I make a snapshot of / and there are some separate partitions
mounted under /mnt/ or /home/, will snapshot skip them?
4. If I have a snapshot of /, can I completely erase this partition and
later restore it in full form that snapshot, or do snapshots work only
if a limited number of files has been changed?
If the former, then does it mean that snapshot size will be comparable
to the original data size?
5. Can a snapshot be stored on a different partition? And if so, does
that partition have to be BTRFS too? I ask, because I would also want to
store snapshots in a cloud storage.
Thanks.
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