User Data Migration

[SebastianKrupinski]

Feature Request

As a Nextcloud user I want to be able to export my data from the NC instance

Describe the solution you'd like

Implement a migrator: https://docs.nextcloud.com/server/latest/developer_manual/digging_deeper/user_migration.html#register-a-migrator

Work packages

• Migrate calendars and their events
• Migrate subscriptions
• Migrate appointment configurations
• Migrate proposals
• User manual documentation

[ChristophWurst]

I've added the missing subscriptions to the work packages.

@SebastianKrupinski to take confusion about the state of this task, could you please only check work packages that are actually done, as in merged? appointment configurations and proposals have open PRs. An open PR doesn't mean that the work is done.