Sync clock with database every 10 mins

[MichaelZhao21]

Describe the feature you'd like

Currently this setting only will sync whenever the user pauses/unpauses/resets the clock. We need to add a backend timer that will run every 10 mins and saves the clock to the database. I propose we use this: https://stackoverflow.com/questions/16466320/is-there-a-way-to-do-repetitive-tasks-at-intervals.

Another small change is that we should probably change the wording to include info about how the timer is backed up when pausing/unpausing, as well as the fact that it doesn't do that if the box is unchecked.

Pre-existing Issue or Justification

...this is caused by #165 but I have decided that this is lower priority and thus doesn't need to be implemented atm.

Additional context

No response