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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Your first problem here is if your computer or hard drives starts failing, you lose your data. There are cloud storage services out there that offers encryption, multifactor authentication and multi device syncing. pcloud.com storage offers those services, there could be better services out there, check the reviews if you want something better. Having a cloud storage account that uses multi factor authentication and encryption is a good security. Next, have all your drives encrypted in case of theft, they wouldn't be able to access your data. Then, you can setup to sync your files from your encrypted drives to your cloud storage so that you have multiple backups... onsite, offsite, and cloud. Now, you wouldn't have a need to VPN if you just need to access your files as they are always synced in the cloud. Now that you have redundant backups and encryption, invest in a good network firewall. Netgate which uses pfSense have affordable firewalls that has scalable and highly configurable software. But if you're not running any web services, then the out of the box firewall configuration of Netgate should be good enough for the time being.