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Some process could be done only, when system is not actively used. For example,
btrfs deduplication, compression, etc. Since deduplication is ram consuming,
there is need to ran it only, when it would not prevent from normal computer
usage. And that is hard to discover, when is right moment.

Allow to select by user, clean my system (special app: console and GUI). Also,
allow to set turn of system, when clean process are done. Maybe add special
checkbox to shutdown menu, called clean before shutdown. In any case, user
could stop clean procedure and select between do nothing or shutdown.

During normal usage, only low-overhead process could be made, which aims to
gather information to better clean system.

Reproducible: Always




What clean process could do:
- Deduplicate
- Compression based on how often files are used (more often used - less
compression radio; Imagine download directory get compressed based on this
information)
- Data backup
- Prefetch mechanism (like in Windows) based on data about how often some
executables are executed