Backup option to remove a leading path prefix

Output of `restic version` -------------------------- ``` restic 0.9.3 compiled with go1.11.1 on linux/amd64 ``` What should restic do differently? Which functionality do you think we should add? ---------------------------------------------------------------------------------- It would be helpful to have an option to `restic backup` that says "strip this leading path from the paths of all backed-up files." For example, `--backup-root /some/path`. This would have the following effects: * A file `/some/path/to/file` would be stored in the snapshot as `/to/file`. * This file would also have its metadata check performed against `/to/file` in the parent snapshot. * You are not permitted to specify files/directories to `restic backup` that do not begin with this prefix. (I think this may be related to #1376.) What are you trying to do? -------------------------- One of our backup scripts is run on a system with many running services that a cannot stop. These services guarantee that recovery is possible from a specific point in time (e.g. they do enough journaling to get their data back in a consistent state following a power cut). However, restic backups are not atomic; therefore, restic backups break the recovery guarantee from the service. To fix this, we: 1. Take an LVM snapshot of `/`. The snapshot is an atomic block-level copy of the entire volume. 2. Mount the LVM snapshot under `/mnt/backup-snapshot`. 3. Run the restic backup against `/mnt/backup-snapshot`. 4. Un

Posted by cdhowie on Nov 16, 2018, 8:19 PM

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