Hi there, @daralp. Welcome to the Fitbit Community Forums. I'm sorry to hear that about your data loss. I understand your concern, I will do my best to help you with this!
Please be aware that most Fitbit devices store up to 7 days of detailed minute-by-minute data. If you wait longer than 7 days before syncing, you may only see the most recent week's detailed data. Summary data (calories, distance, steps, and floors) will be stored for 30 days. Nevertheless, if your Fitbit device was unpaired from your Fitbit account during this period of time, neither the 7 days can be recovered or restored.
My best advice for these instances is to make sure that your Charge 5 is syncing periodically or at least, once a day. As per the description of your post, it sounds like you've been having syncing issues lately and not just the night you mentioned. If that describes your issue, please see Why won't my Fitbit device sync?
Regarding the data loss, if you remember the exact amount of steps or the name of the activity you performed, you can try manually logging the activity. For more information, see How do I manually log exercises in the Fitbit app?
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