For me personally, I split up my data into different cloud storage solutions depending on the sensitivity of the data, and frequency of access on the data.
For stuff I need quick access to, I use cryptomator with MEGA. MEGA has a pretty decent Linux App, but recommend using with cryptomancer or any sync-friendly encryption tool so that they can't read the data.
For stuff I infrequently access, I personally just use Proton Drive. Plan to fully switch to using them once they have a functional Linux desktop application that supports syncing.
For more sensitive stuff like SSH Keys or documents that might contain my sensitive personal information, I personally just use VeraCrypt and store the encrypted file on a thumb drive, backing it up to another thumb drive every week.