Support external mounted partitions

[framps]

As of now only the boot and root partition are saved in normal mode. Partition oriented mode can be used to backup additional local partitions but they have to reside on the same device as the root partition.

It' quite common to have additional data on other external partitions (not on the root device) which also should be saved.

Right now tar and rsync uses option -X which causes them to stay on the same device. Either -X should be removed and all external mounted partitions excluded if they are not included in an option or the included partition will be saved in a following step.

[framps]

Backup

1. An additional configuration option DEFAULT_MOUNTPOINTS_TO_BACKUP and option -X allows to define a list of mountpoints of partitions to be included in the backup. The backup type selected for the OS is used also to save these partitions (tar or rsync). Backuptype dd doesn't support additional partitions.
   Example: DEFAULT_MOUNTPOINTS_TO_BACKUP="/influxDB /mnt/videos /mnt/photos. Default is an empty number of mounts to backup.
2. The additional partition backups are stored in an encoded backup directory in the backup. Every / will be substituted by _. Therefore a mountpoint which includes _ is not supported. In addition a mountpoint has to be absolute and start with /.
   Example: /home/pi/my/mountpoint will be store in the backup directory as _home_pi_my_mountpoint.
3. The partitions are saved in the sequence they are defined in the option
4. Only local mounted devices are supported. Network mounted partitions (nfs, samba, ...) are not supported.
5. This new feature is available only in the partition oriented mode.

Restore

1. The restore uses the same mountpoints as used in the backup and can be derived from the subdirectory name used in the backup (encoding see above). If there is no partition mounted on any mountpoint the restore fails. This is tested before the restore starts.
2. Configuration option DEFAULT_MOUNTPPOINTS_TO_RESTORE will allow to define which external partitions should be restored. Default is an empty number of mounts to restore. Corresponding option is -X .

Installer

See #762

[codkan]

Just to double-check, this means that I would be able to include my external hard drive mounted to /media in the full backup, right? Because that would be amazing, it's the only thing I'm missing from raspiBackup

[framps]

I would be able to include my external hard drive mounted to /media in the full backup

Yes 😄

[codkan]

That's incredible, can't wait!

[codkan]

Any update on this??

[framps]

You can check on the issues page which issues I'm working on right now 😉

[codkan]

How's this coming along? Can't wait to finally backup all my external media along with my system

[framps]

Keep in mind I work on raspiBackup in my spare time and not 8 hours every day. You don't speed up the implementation of this feature if you ask for progress all the time.