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Tips

Excluding files from the snapshot operation

If you wish to exclude files under a particular directory, simply creating a pertinent subvolume containing those files in place of the directory allows to exclude them to be a part of the snapshot operation.

Database file and CoW issue

Please consider to set 'no copy on write' (C) attribute recursively on the directory prior to placing files such as the database file in it. For example:

 $ sudo chattr -R +C /var/lib/mysql

I suppose that you need to stop database program before making snapshot/backup of the filesystem containing it.

Maybe the same goes with the actively used disk image file.

rsync.net

To use rsync.net, we need to set up ssh keys.

rsync.net: Recovering files (basics)

For rsync.net service, following should help you recover the last data, use rsync as:

 $ mkdir -p ~/oldrsync
 $ cd ~/oldrsync
 $ rsync -a de1234@de1234.rsync.net:rsync .
 $ ls -laR

rsync.net: Recovering files (older)

To recover the older backup data, use rsync as:

 $ rsync -a de1234@de1234.rsync.net:.zfs/snapshot/daily_2022-01-01 .

For list of available older backups

 $ ssh de1234@de1234.rsync.net ls -lsa .zfs/snapshot