Something like Amazon Glacier is your best bet if you don’t access data often and are okay with paying a (per-GB) monthly fee. Otherwise, you may want to build a NAS PC with high levels of disk redundancy (RAID5 or RAIDZ2)

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GrapheneOS has strict sandboxing for all apps. App A cannot talk to App B unless given explicit user permission. Google Play services is not installed by default, and if you do install it, it’s subject to the same sandbox. This basically addresses all userspace tracking concerns, unless you actively choose to weaken those defaults.

GrapheneOS has strict sandboxing for all apps. App A cannot talk to App B unless given explicit user permission. Google Play services is not installed by default, and if you do install it, it’s subject to the same sandbox. This basically addresses rid of all userspace tracking concerns, unless you actively choose to weaken those defaults.

(There are still concerns associated with the closed source firmware of the baseband modem)