Add option to configure preview (and thumbnail, ect.) location

[josh4trunks]

Here's my use case where this would be beneficial.

Production Server 'A'

• server side encryption enabled
• previews enabled
• owncloud application (www) directory, data-directory (files), and database are snapshoted and backed up to server B
• keys used for unencryption are only stored in /tmp which isn't backed up to server B and is likely cleared upon reboot

Server 'B'

• everything crucial to disaster recovery on server A is safely backed up here
• user files are also encrypted here and unreadable by an attacker

My proposal is that you could specify the preview location which could be be a location that isn't backed up to server B. this could be extended to be a 'cache' location which could house any unencrypted files that aren't crucial to backup and could be regenerated if you had to restore from backup.
https://doc.owncloud.org/server/8.1/admin_manual/configuration_files/encryption_configuration.html#files-not-encrypted

[josh4trunks]

this might be possible now using a selective rsync for backup but in my case everything resides on ZFS datasets which I am backing up and sending remotely

[oparoz]

@josh4trunks Can't you create a dataset just for the thumbnails folder? Even if you snapshot it (for local issues), you don't need to send it over for DR.

[josh4trunks]

@oparoz
I don't think that is practical as the folders in question live inside the user folders, so this would not automatically adjust when adding/deleting users.

[oparoz]

Ah, yes, of course...

It will be easier if shared thumbnails ever gets implemented. The previews would all live in data/thumbnails/fileIdHash, but it will be much more time consuming to get rid of all the data belonging to a user.

[PVince81]

Closing in favor of #28939

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