I dont! In fact I assume it has been to some extent and that I would be unable to detect this. Going from that assumption, I take care to keep encrypted backup

I dont! In fact I assume it has been to some extent and that I would be unable to detect this. Going from that assumption, I take care to keep encrypted backups of all of my important files both locally on another machine and remotely. I also use two-factor authentication wherever possible, because I find it unlikely that the same attacker would gain access to both my PC and phone. Additionally, I have a second phone with no SIM card that I use for some TOTP 2 factor accounts that I wish to remain especially secure. Operating at the assumption that you have already been compromised allows you to prepare for the worst should you truly be.