I'm surprised and confused that this sub and r/Backup, r/privacy, and r/netsec don't seem to have much information about file encryption other than old references to veracrypt and cryptomator. I saw a few references to diskcryptor as well, plus cloudally and gmail backup (for email-specific backups on a regular basis) and backblaze/synology for cloud backups.
I need to regularly backup work and personal files (M365 and many audio and video recordings), plus work emails (I'm using protonmail) and personal emails (gmail). I have several external hard drives (1-4TB each), OneDrive, and Google Drive (want to switch the cloud ones to synology I guess, when I set up NAS). Everything needs to be encrypted, though. My research says that Bitlocker isn't reliable if I need to protect files from Microsoft (work files are confidential attorney-client privileged).
What do people do? Am I stuck with veracrypt (hard drives, laptop) and cryptomator (cloud backups)? Is diskcryptor a viable and private option?